saving money at the pump

saving money at the pump

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  • #845581
    jon hill 3
    Participant
      @jonhill3

      What with the price of petrol and diesel being what it is I was looking to save money on what I usually buy in this case premium diesel.  My 20yr old Hiace doesn’t like cheap diesel however I have been considering using an octane/lub/cleaning additive with budget diesel.  My knowledge of cetane ratings and the chemstry of automotive diesel is fairly minimal so looking for a bit of background knowledge….

      In particular what are the key ingredients in certain brand additives to look out for?

      #845596
      not done it yet
      Participant
        @notdoneityet

        I would suggest you bite the bullet and splash out for the usual fuel.

        But I’m a bit biased – I feed electrons to my vehicle.🙂  240 miles tomorrow and it’ll cost me less than £4.50 for electrons.  That will increase to £6, next month, but I’ll still get the same quality electrons.

        #845601
        jimmy b
        Participant
          @jimmyb

          At 23mpg average, I’ll just have not worry too much 😆

           

          Jimb

          #845609
          JA
          Participant
            @ja

            From working as a combustion engineer I think I know a little bit about fuel additives. Of interest:

            • Cleaning additive is probably an additive originally developed to increase the thermal stabilty of fuel (nothing to do with IC engines). However it was found to have powerful cleaning properties. The firm that developed it was bought out by GE who then licenced the European production to Shell. It is offered on Shell filling station forecourts and a few others.
            • I know very little about Cetane additives other than I know the sales director of a firm that makes it. The firm is an explosive manufacturer. I leave the rest to your imagination.

            What ever the brand I guess that an off the shelf additive is made by one company.

            JA

             

            #845644
            John Haine
            Participant
              @johnhaine32865
              On not done it yet Said:

              I wo

               

              But I’m a bit biased – I feed electrons to my vehicle.🙂  240 miles tomorrow and it’ll cost me less than £4.50 for electrons.  That will increase to £6, next month, but I’ll still get the same quality electrons.

              Trouble is they come out as fast as you feed ’em in!

              #845675
              Dave Wootton
              Participant
                @davewootton

                I had a BMW 320D a few years ago and when I bought it at about 46,000 miles my friendly mechanic recommended Millers additive, his advice was that it made the engine run cleaner and also lubricated the tank pump which is an expensive to replace item. My impression was the engine ran quieter and slightly smoother, whether it improved the MPG I’m not sure, but I was always impressed by the cars economy. I finally sold the car about ten years on at 280.000 miles having had no engine ,injector or tank pump problems (just a horrendously expensive dual mass flywheel explosion!) , maybe I was lucky with the car or the Millers helped, but if I bought another diesel I’d use it again. I bought it in bulk 5L and decanted it, it’s fairly expensive stuff.

                #845698
                duncan webster 1
                Participant
                  @duncanwebster1

                  According to a friend of mine who was an enthusiast, Gardner advised the best way to dispose of old oil after an oil change was to mix it in with the diesel at a fairly low concentration. Diesel itself is not too bad a lubricant, adding a bit of oil might make it better. I wouldn’t try it on a modern engine, they are a bit fussy.

                  #845740
                  howardb
                  Participant
                    @howardb

                    I have used Miller’s Diesel Power Ecomax additive in the past, it raises the cetane number a little, reduces diesel clatter a bit by improving the combustion and improves mpg.

                    But by the time you’ve saved money by buying cheaper diesel, then spent the saving on buying the additive you will probably be back where you started.

                    Worth a try perhaps.

                    https://www.halfords.com/motoring/engine-oils-and-fluids/fuel-and-oil-additives/millers-diesel-power-ecomax-500ml-811125.html

                    And – https://www.howengineeringworks.com/questions/what-is-cetane-number/

                    Another take on a diesel additive:-

                    https://www.researchgate.net/publication/373091538_INVESTIGATION_OF_THE_USE_OF_ACETONE_AS_AN_ADDITIVE_IN_DIESEL_ENGINES

                     

                     

                    #845746
                    not done it yet
                    Participant
                      @notdoneityet

                       

                      On John Haine Said:
                      On not done it yet Said:

                      I wo

                       

                      But I’m a bit biased – I feed electrons to my vehicle.🙂  240 miles tomorrow and it’ll cost me less than £4.50 for electrons.  That will increase to £6, next month, but I’ll still get the same quality electrons.

                      Trouble is they come out as fast as you feed ’em in!

                       

                       

                       

                      I drove just a tad over 250 miles today.  Still 42 miles of range left.  On charge, now, and will be at  80% just less than in 24 hours of charging on a granny charger,  That cost me less than four quid (but that will go up quite a bit from May first).

                      If you can beat that with a dirty, smelly, toxic fossil burner, let me know!🙂🙂
                      I usually charge at 7kW, but not where I am now, so I have to make do with 30p/kWh instead of 6.5p/kWh (at present).  Don’t expect any equivalent dirty, smelly, toxic fossil burner can better the 30p/kWh either!
                      #845799
                      blowlamp
                      Participant
                        @blowlamp

                        From T’internet:

                        “BP Pulse charging prices vary based on the type of charger and payment method. As of now, registered users pay around 77p per kWh, while contactless payments are priced at 79p per kWh, with subscription users paying 63p per kWh.”

                        So as soon as you can’t recharge at home, the picture changes.

                        Martin.

                        #845841
                        Vic
                        Participant
                          @vic
                          On blowlamp Said:

                          From T’internet:

                          “BP Pulse charging prices vary based on the type of charger and payment method. As of now, registered users pay around 77p per kWh, while contactless payments are priced at 79p per kWh, with subscription users paying 63p per kWh.”

                          So as soon as you can’t recharge at home, the picture changes.

                          Martin.

                          IMG_0522

                          #845842
                          Robert Atkinson 2
                          Participant
                            @robertatkinson2

                            A quick check indicates a ICE car needs to do about 40 MPG to match a Tesla Model 3 charged at 77p / kWh. So not that much in it.

                            #845844
                            howardb
                            Participant
                              @howardb
                              #845853
                              not done it yet
                              Participant
                                @notdoneityet
                                On howardb Said:

                                Electric vs Diesel UK: Which Is Cheaper Per Mile in 2026?

                                EV Depreciation vs Savings UK: When Do Electric Cars Break Even?

                                As Robert has said not a lot in it.

                                On Robert Atkinson 2 Said:

                                A quick check indicates a ICE car needs to do about 40 MPG to match a Tesla Model 3 charged at 77p / kWh. So not that much in it.

                                Only an idiot would pay 77p/kWh if they owned a Tesla.  They would be using the supercharger network at about 40p, or less.

                                Stupid comparisons mean nothing at all – just someone trying to justify their own views.

                                #845855
                                Andrew Tinsley
                                Participant
                                  @andrewtinsley63637

                                  My 2.0 litre Mondeo Estate consistently averages 61mpg and thus has a range of well over 600 miles. It takes approximately 3 minutes to refuel I have had the car for 15 years and so it is fully depreciated, unlike NDY’s electric car. So why on earth would I want to swop? I much prefer smelly polluting ICE cars.

                                  Andrew.

                                  #845858
                                  Robert Atkinson 2
                                  Participant
                                    @robertatkinson2
                                    On not done it yet Said:
                                    On howardb Said:

                                    Electric vs Diesel UK: Which Is Cheaper Per Mile in 2026?

                                    EV Depreciation vs Savings UK: When Do Electric Cars Break Even?

                                    As Robert has said not a lot in it.

                                    On Robert Atkinson 2 Said:

                                    A quick check indicates a ICE car needs to do about 40 MPG to match a Tesla Model 3 charged at 77p / kWh. So not that much in it.

                                    Only an idiot would pay 77p/kWh if they owned a Tesla.  They would be using the supercharger network at about 40p, or less.

                                    Stupid comparisons mean nothing at all – just someone trying to justify their own views.

                                    That’s a little harsh.

                                    I used the Tesla as an example of typical miles per kWh, not an example of a particular make. Additionally superchargers are not universally available. The services closest to me does not have tham for example.
                                    I was not trying to justify any view. I took a typical EV “comsumption” and worked out what Fuel MPG would match it at current fuel prices local to me. All averaged out. I’m not anti or pro EV or ICE, they are different solutions and one may suit some users more than the other. A Google search indicates that current Tesla charge costs average nearer 50p/kWh than 40p.

                                    Robert.

                                     

                                    #845859
                                    old mart
                                    Participant
                                      @oldmart

                                      My Corsa D with the 1.7 diesel Izusu engine gets 46mpg around town and up to 70 mpg if I drive fully within the speed limits on motorways. When I had a new Hyundai i20 1 litre 48V hybrid courtesy car, it only got 45mpg at 70 on the motorway, I wouldn’t have been able to afford the fuel. As it is the diesel costs over £10 per gallon thanks to Donald.

                                      #845860
                                      duncan webster 1
                                      Participant
                                        @duncanwebster1

                                        #2  son has an EV, he does the vast majority of charging at home in the early hours, when the cost is much less than quoted above. Just like with petrol, motorway services are abusing their monopoly position by charging ridiculous prices. 2 garages local to me stay open all night and only charge a few pence more than supermarkets for fuel. Time for more competition? And while I’m on, it used to be a requirement that motorway services provided free airline and water for your radiator. Has this been reminded, as they all charge.

                                        #845883
                                        not done it yet
                                        Participant
                                          @notdoneityet

                                          As I posted on a different thread, I travelled for a total energy cost 250 miles for less than £4 for electrons.  The return trip will likely cost as much as four times that amount because I will be charging on solar and a fixed domestic tariff at where I am staying.  That 4p/mile (for the round trip) is not typical of my energy cost as about 90% of my charging is at Octopus Go tariff (6.5p/kWh currently, but rising to 8.625p/kWh in May).  Since October last year the car has averaged 3.6 miles/kWh.  I expect better than that now summer has nearly arrived.  Work out the energy cost yourself.

                                          Those “break-even” claims also ignore the maintenance costs – just to make them seem better than an EV.  The maintenance/service cost for mine has been £200 over three years – and no Ad-blue expense (for diesel cars) for my EV.🙂

                                          Robert very specifically picked on a Tesla Model 3 in his post.  Very unfortunate to use duff comparisons and be miffed when called out for it.  Many other small EVs will be doing much better than even a Tesla M3.  There are loads of them that have come to the market recently.

                                          Depreciation, for mine, was initially high, but that is not the case now.  My purchase was a ‘must have’ at the time – when my wife was nearing the end.  There were only 4 cars, of that specification, in the country.   I have no regrets on paying the price at the time, considering our predicament.

                                          Most comparisons are for similar sized cars, not necessarily to the same specification.  You won’t find a car with the same performance as mine at the comparison prices mostly quoted.

                                          All things considered, EVs are the car of the future.  Nobody will be able to buy a new car, with just a fossil burning engine, in the UK in what – another 4 years time?  No more fossil-burning new cars from 2035 in the UK.  Some need to get used to it and not bury their head in the sand.

                                          #845887
                                          Vic
                                          Participant
                                            @vic
                                            On not done it yet Said:
                                            On howardb Said:

                                            Electric vs Diesel UK: Which Is Cheaper Per Mile in 2026?

                                            EV Depreciation vs Savings UK: When Do Electric Cars Break Even?

                                            As Robert has said not a lot in it.

                                            On Robert Atkinson 2 Said:

                                            A quick check indicates a ICE car needs to do about 40 MPG to match a Tesla Model 3 charged at 77p / kWh. So not that much in it.

                                            Only an idiot would pay 77p/kWh if they owned a Tesla.  They would be using the supercharger network at about 40p, or less.

                                            Stupid comparisons mean nothing at all – just someone trying to justify their own views.

                                            Agreed. Some Tesla owners are also still paying nothing when using the Tesla Supercharger Network. Apparently 93% of UK EV owners charge mostly as home where the cost is minimal (or zero during the summer if you have solar panels)

                                            #845920
                                            howardb
                                            Participant
                                              @howardb

                                              “No more fossil-burning new cars from 2035 in the UK.  Some need to get used to it and not bury their head in the sand”

                                              The percentage of pure EV’s registered and used on UK roads is 5.7% of the total number registered in March 2026.

                                              https://www.zapmap.com/ev-stats/ev-market

                                              Not exactly popular are they?

                                              Taking your comment and rewriting it to reflect reality:-

                                              “Some need to get used to the fact that there is not enough copper being mined or produced to support the so-called EV revolution and not bury their head in the sand (or a copper mine!)”

                                              That’s in addition to the copper required to upgrade power grids.

                                              An EV requires three to five times more copper than petrol or diesel cars, not to mention the copper required for upgrades to the electricity grid.

                                              “A normal Honda Accord needs about 40 pounds of copper. The same battery electric Honda Accord needs almost 200 pounds of copper,” said Adam Simon, professor of earth and environmental studies at the University of Michigan.

                                              “We show in the paper that the amount of copper needed is essentially impossible for mining companies to produce.”

                                              https://engineers.scot/news/2024-07-14-the-amount-of-copper-needed-to-build-evs-is-impossible-for-mining-companies-to-produce

                                               

                                               

                                              #845934
                                              blowlamp
                                              Participant
                                                @blowlamp

                                                With the state of the roads, servicing costs and the price of fuel nowadays, I think a fully rebuilt 2CV starts to make a lot of sense.

                                                 

                                                Martin.

                                                #845954
                                                Robert Atkinson 2
                                                Participant
                                                  @robertatkinson2
                                                  On not done it yet Said:

                                                  <SNIP>

                                                  Since October last year the car has averaged 3.6 miles/kWh.  I expect better than that now summer has nearly arrived.  Work out the energy cost yourself.

                                                  Those “break-even” claims also ignore the maintenance costs – just to make them seem better than an EV.  The maintenance/service cost for mine has been £200 over three years – and no Ad-blue expense (for diesel cars) for my EV.🙂

                                                  Robert very specifically picked on a Tesla Model 3 in his post.  Very unfortunate to use duff comparisons and be miffed when called out for it.  Many other small EVs will be doing much better than even a Tesla M3.  There are loads of them that have come to the market recently.

                                                  <SNIP>

                                                  I don’t know how you could posssibly know that I “very specifically selected” any model of EV. I pretty much randomly chose the M3 as it seems popular and isn’t huge. My calculated miles per kWh (based on averages of published claimed and real world figures) was just over 4m/kWh so actually better than your EV. Your car would cost 21.39p / mile at the BP 77p rate. So at £1.60 a litre an ICE vehicle only has to make 34 mpg to match it.

                                                  Robert.

                                                  #845955
                                                  Adrian R2
                                                  Participant
                                                    @adrianr2

                                                    All the “there isn’t enough X to do Y” arguments ignore the basics of the commodity market – if something is scare, it becomes expensive and therefore it is either economic to produce/extract/recycle more or for the users to find an alternative.

                                                    Examples for vehicles include lithium being replaced by sodium in batteries, wiring using higher voltages so lower currents and thinner conductors, zonal architecture reducing the number of cables and use of copper coated aluminium rather than pure.

                                                     

                                                     

                                                     

                                                     

                                                     

                                                     

                                                     

                                                     

                                                     

                                                     

                                                    #845956
                                                    Nealeb
                                                    Participant
                                                      @nealeb

                                                      Why is there an implicit assumption that there is a one-size-fits-all solution, or even that one should exist? If you drive a 15-year-old car that gives acceptable economy and suits your needs, why change it? A perfectly good reason why there are “only” 5.7% EVs on the road at the moment. It would be daft to expect them all to change at once. To demonstrate how a single carefully-chosen number can be misleading, the same report from which that data point was taken also says,

                                                      “In 2025 473,348 new fully electric cars were registered, which was 23.4% market share of all new cars last year and 91,378 more fully electric cars than were registered in 2024.”

                                                      A different spin on the numbers?

                                                      I am very happy indeed with my new EV. I am fortunate in being able to charge at home using cheap overnight tariffs (arguably cheaper than using my own solar energy) and recognise that I shall have to bite the bullet for the 25% of any annual mileage where I cannot do that. But I’m still estimating that overall energy cost will be around 40% of the diesel for the same mix. But I don’t pull a trailer or do the kind of away-from-home commuting journeys that I once did. I do feel happier with reducing pollution and noise for the local journeys I do do.

                                                      “Your mileage may vary” has never been so true.

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