a18eem Posted October 28, 2005 Report Share Posted October 28, 2005 oohhh you never guess what... tesco are doing 99 ron fuel! i thought i will share that with everyone...just in case someone doesnt shop at tesco. Link to comment Share on other sites More sharing options...
doogal1972 Posted October 28, 2005 Report Share Posted October 28, 2005 How much is that? 500 quid a gallon? Link to comment Share on other sites More sharing options...
Simonl Posted October 28, 2005 Report Share Posted October 28, 2005 It's , don't bother!!! I like you got all excited, until i put a tankfull in. Link to comment Share on other sites More sharing options...
doogal1972 Posted October 28, 2005 Report Share Posted October 28, 2005 I don't even run 98 ron cos it's just too bloody expensive with the amount of miles I do. Is optimax really that much better than 95 ron? I've tried it and noticed pretty much no difference in performance or fuel economy to be honest. Am I missing something here? Link to comment Share on other sites More sharing options...
Chelsea Mick Posted October 28, 2005 Report Share Posted October 28, 2005 All I can say is that when I took my car to be re-mapped, after it had been done I was asked by the technician what petrol I was using. I was fairly new to the modding scene back then and I answered just normal supermarket unleaded fuel. When the said technician picked his self up off the floor after rolling about in fits of laughter, he reckoned I was around 40 bhp down on what the car should've been. Ever since that day I have used optimax and millers. So I can't really offer you any other answer apart from if it's good enough for the tuners to recommend 98 ron (at least) then it's good enough for me... Oh and when you open your petrol cap of a S3, it does say inside on the sticker to use min 98 ron..... And I will be looking at my local Tescos for the 99 ron fuel when I need to fill up again. Link to comment Share on other sites More sharing options...
fingermouse Posted October 28, 2005 Report Share Posted October 28, 2005 you also get more mpg on average on optimax. 95 ron wont ever come near my S3 !!! Link to comment Share on other sites More sharing options...
Gren Posted October 28, 2005 Report Share Posted October 28, 2005 [ QUOTE ] you also get more mpg on average on optimax. 95 ron wont ever come near my S3 !!! [/ QUOTE ] Too right - get around 3-4mpg more when using super unleaded. Optimax gets around 1 or so mpg more than normal super. Link to comment Share on other sites More sharing options...
doogal1972 Posted October 28, 2005 Report Share Posted October 28, 2005 On my fuel flap it says 95/98 ron. I know that the 98 is a better quality fuel with all it's additives etc. but my main question is: Is the price difference worth the extra cost when you do a lot of miles? Is there really that much difference in performance cos I didn't really notice much when I tried it. Is it supposed to be noticable as soon as you put it in? Or has it got to clean the engine a bit first? Would the general consensus be go for optimax regardless as it's better for the engine in the long run? Sorry for all the questions but I'd like to get to the bottom of the whole octane thing. cheers Link to comment Share on other sites More sharing options...
Chelsea Mick Posted October 28, 2005 Report Share Posted October 28, 2005 I was told that after 3 or 4 tank fulls of optimax I would be able to tell the difference. Well to be honest, after 3 or 4 tank fulls, it didn't really jump out and shout out that I was going faster or my car was performing any better but that is beacuse I suppose it was a gradual transition between normal unleaded and optimax. I reckon if I was to put normal unleaded in my car now I would be able to tell the difference. Now as for using Millers.......That's another story Link to comment Share on other sites More sharing options...
doogal1972 Posted October 28, 2005 Report Share Posted October 28, 2005 Alright guys, you've talked me into it, I'll do it. 4 tanks of optimax here we come to give it a proper go! Link to comment Share on other sites More sharing options...
Tomk Posted October 28, 2005 Report Share Posted October 28, 2005 erm sorry to be different here but i do 3 tanks standard fule to one tank optimax, keeps things ticking over niceley and saves me about £10 a week Link to comment Share on other sites More sharing options...
Tomk Posted October 28, 2005 Report Share Posted October 28, 2005 right just been and got a tank , cos its all there doing now for super unleded , 93.9p though it had to be worth a tank Link to comment Share on other sites More sharing options...
doogal1972 Posted October 28, 2005 Report Share Posted October 28, 2005 So what do you guys think the PS I'm missing by running 95 ron as apposed to 98? Link to comment Share on other sites More sharing options...
Fergy Posted October 29, 2005 Report Share Posted October 29, 2005 give it the good stuff dude Link to comment Share on other sites More sharing options...
fingermouse Posted October 29, 2005 Report Share Posted October 29, 2005 wouldn`t using 95 ron over 98 ron loose you about 3% in power ?? so roughly 10 bhp ?? or is that the wrong way of looking at it Link to comment Share on other sites More sharing options...
khufu Posted October 29, 2005 Report Share Posted October 29, 2005 the higher octane rating lets the ignition advance more as it reduces pinking. The ECU will do this gradually hence it can take a few tanks to take advantage. It will be more noticable if you then go back to 95 as the ECU will retard it instantly to avoid pinking. Link to comment Share on other sites More sharing options...
Paul Posted October 29, 2005 Report Share Posted October 29, 2005 mine drinks Optimax only currently. yet to see a tesco with 99 ron fuel round here. Link to comment Share on other sites More sharing options...
doogal1972 Posted October 31, 2005 Report Share Posted October 31, 2005 Right, I'm gonna give it Optimax only to keep my motor happy then! Link to comment Share on other sites More sharing options...
Wikkus Posted November 7, 2005 Report Share Posted November 7, 2005 Bit late to the party, so to speak, but yes, Optimax is the way to go. The engine-management is, indeed, smart enough to know what you're feeding it and will, as others have said, retard or advance the spark accordingly. Not a massive difference, but hell, I want *all* my ponies! :-) Link to comment Share on other sites More sharing options...
Fergy Posted November 8, 2005 Report Share Posted November 8, 2005 watch fifthgear on monday 14th for a comparison Link to comment Share on other sites More sharing options...
MOSE Posted November 8, 2005 Report Share Posted November 8, 2005 Not sure if anyone else has posted this, but here is a quick website giving all the locations of Tesco stores where 99 Ron fuel can be found. TESCOS with 99Ron Link to comment Share on other sites More sharing options...
Cupramax Posted November 8, 2005 Report Share Posted November 8, 2005 Intereting to see some of the comments on this post re supermarket fuel... I have been using Tesco's Super 99 since my local started stocking it a couple of months ago. Yesterday I had my car remapped by Forge and we did some power runs logging igniton retard with VAGCOM. My car running at peak power was backing off no more than 1/2 degree on the Tesco fuel. Same engine and map on a Golf Mkv Gti running on BP ultimate or Optimax backs off 3 degrees. Interesting eh and I can think of no other reason for this other than the fuel is better... Link to comment Share on other sites More sharing options...
purple_nurple Posted November 8, 2005 Report Share Posted November 8, 2005 Pay for the additive package if you're going to buy premium fuel. Greenenergy have noble motives, but the health of your engine is perhapse not their highest priority. Link to comment Share on other sites More sharing options...
Tomk Posted November 8, 2005 Report Share Posted November 8, 2005 well my car is running at 34.5 on the dis rather than about 32 on standard 95 Link to comment Share on other sites More sharing options...
clowesy Posted November 8, 2005 Report Share Posted November 8, 2005 I was in Singapore in the Summer they seem to have V Power Shell which is 100 RON. Probably much cheaper than Tesco 95 Cheers Clowesy Link to comment Share on other sites More sharing options...
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