kenyon Posted August 12, 2013 Report Share Posted August 12, 2013 I know this has been done / discussed before. However i am going to do it again ! I wondered what is better in terms of MPG if any out of the premium fuel (in this case tesco momentum 99) and standard fuel (again tesco's standard fuel 95) So I traveled similar journeys with both - premium on my way out to visit family and standard on the way back. i put £25 worth of fuel in. Premium = 141.9 Standard = 135.9 surprisingly i got 152 miles from the premium and 149 out of the standard. Which mean although i got the same value out of both fuels i got better MPG from the Premium fuel. premium = 39.2MPG standard = 36.8MPG so it cost no more to use the premium although their is an extra cost at the pump and you get better protection and performance. No excuse to use poor fuel then :-) Link to comment Share on other sites More sharing options...
dublet Posted August 12, 2013 Report Share Posted August 12, 2013 But it does work out to 0.9335526316p/mile for premium vs 0.9120805369p/mile for standard, so every mile costs you 0.02p extra. Link to comment Share on other sites More sharing options...
Bill T Posted August 12, 2013 Report Share Posted August 12, 2013 I think 152 miles doesn't come close to any type of objective test. I get drastically different MPG on the same fuel on the same day, weather, traffic frame of mind, etc etc all have an effect. Link to comment Share on other sites More sharing options...
kenyon Posted August 13, 2013 Author Report Share Posted August 13, 2013 I do agree that this is not a pragmatic test nor does it give a good representation of what results others could expect from the same fuel. However I do think this gives a good idea for comparison The journey was on the same day their was a 1 degree heat difference, cooler on the standard fuel and my driving style remained the same for all intense and purpose. Although that is impossible to prove on country roads I was sharing my experience Link to comment Share on other sites More sharing options...
Zorg Posted August 13, 2013 Report Share Posted August 13, 2013 Did someone say you've got to reset ECU to take the different fuel? Link to comment Share on other sites More sharing options...
simonwref Posted August 13, 2013 Report Share Posted August 13, 2013 But it does work out to 0.9335526316p/mile for premium vs 0.9120805369p/mile for standard, so every mile costs you 0.02p extra. I think the maths is a bit wrong there, dubs. Link to comment Share on other sites More sharing options...
dublet Posted August 13, 2013 Report Share Posted August 13, 2013 The maths is great. But the numbers don't make sense. Link to comment Share on other sites More sharing options...
simonwref Posted August 13, 2013 Report Share Posted August 13, 2013 I wish i had a car that did a mile for less than a penny. Link to comment Share on other sites More sharing options...
MYK Posted August 13, 2013 Report Share Posted August 13, 2013 Hopefully the ECU was reset after each fuel. and still then you need to give it time to relearn... so really not the best test Nice thoughts though Link to comment Share on other sites More sharing options...
dublet Posted August 13, 2013 Report Share Posted August 13, 2013 It's 38.8 vs 36.4mpg. But as mentioned, such a deviation is well within the realms of other influences. Link to comment Share on other sites More sharing options...
digs Posted August 13, 2013 Report Share Posted August 13, 2013 (edited) Re: fuel....my understanding, High octane is better against knock, yes? That's why we have it.... You can therefore tune your car (or buy it like that) to run leaner than normal and that should give more mpg (and less risk of detonation). Running a car whose ECU does not run leaner with higher octane fuel would treat the fuel exactly the same, and use as much ? EDIT - cope with more advanced ignition Apart form cleaning additives to clean the injectors and improve that side of things, how can the higher octane work unless the Toyoyta ECUs can recognise? Or have I lost the plot? I use high octane to avoid knock on a boosted engine, and can tune for that using emanage. Does the normal ECU recognise the new fuel somehow? Edited August 13, 2013 by digs Link to comment Share on other sites More sharing options...
MYK Posted August 13, 2013 Report Share Posted August 13, 2013 gen 7's have ECU's that learn within parameters. E.g. air flow, fuel etc. So the ECU itself does recognise the different combustion and can alter to suit. Link to comment Share on other sites More sharing options...
digs Posted August 13, 2013 Report Share Posted August 13, 2013 (edited) gen 7's have ECU's that learn within parameters. E.g. air flow, fuel etc. So the ECU itself does recognise the different combustion and can alter to suit. well that would make sense then! EDIT: so the ecu will advanced timing when it learns that the fuel it is using is burning slower? Or similar? Edited August 13, 2013 by digs Link to comment Share on other sites More sharing options...
kenyon Posted August 13, 2013 Author Report Share Posted August 13, 2013 I did reset the Ecu however there was no time for it to adjust to new parameters. Your right so not really valid at all, just interesting that I had put less fuel in drove in a similar manner and still got the same range. Link to comment Share on other sites More sharing options...
sonic Posted August 13, 2013 Report Share Posted August 13, 2013 It's all witch craft and mumbo jumbo I thought even thou the ecu can learn and adjust its self , it still runs with in the parameters of the factory map , so unless its an import mapped for 100 Ron , then premium fuel doesn't make a huge difference on a euro mapped car , hence the higher qouted power figures for imports All I really know , if I run normal fuel in my imported faff , it pinks like a bastard , normally run tescos 99 , but noticed shell v power nitro plus turbo vunderbar does make the car run smoother Link to comment Share on other sites More sharing options...
thermoacc Posted August 13, 2013 Report Share Posted August 13, 2013 I changed from filling up in Tesco to Shell 6-months ago. My car used to average 45mpg on the fuel computer on Tesco juice (a Diesel) and over the last 6-months now averages over 47mpg on Shell. Idle is smoother too. I have never done the math to see if the additional cost is worth it though Link to comment Share on other sites More sharing options...
dingleweed Posted August 13, 2013 Report Share Posted August 13, 2013 ...and you can collect money off fuel vouchers in the shell v-power club! Every little helps. Link to comment Share on other sites More sharing options...
LiamGTR Posted August 13, 2013 Report Share Posted August 13, 2013 But it does work out to 0.9335526316p/mile for premium vs 0.9120805369p/mile for standard, so every mile costs you 0.02p extra. What? This guys Celica does 0.9p/mile? Link to comment Share on other sites More sharing options...
dublet Posted August 13, 2013 Report Share Posted August 13, 2013 I did the right calculcations but with the wrong numbers. :rolleyes: Link to comment Share on other sites More sharing options...
Askari Posted August 13, 2013 Report Share Posted August 13, 2013 This is fun. I love these petrol threads. Did it myself a couple of months ago but messed up the maths. I put the nitro stuff in because it makes me think I'm treating my baby right. If this week's maths say it's better, fine; if next week's says I'm wasting my money, equally fine - the celica makes me feel good and feeding her champagne instead of Asti Spumante is the least I can do in return. But, hey, let's do more of these threads, they're fun! 1 Link to comment Share on other sites More sharing options...
Recommended Posts