33 replies to this topic

[danyeates]

CLICKY Courtesy of JT

[deckard]

Noticed this the other day and have started filling from Tesco's at Eastville in Bristol as they do the Octane 99 for 5p a litre extra. Seems worth it to me if even it just helps a bit. Anyone know where many other garages have started stocking it yet as all I can find is this Tesco and the one at Brislington

[slindborg]

nearly all tescos petrol stations in "the south east" (east anglia + herts and essex, ignoring france.. ooops kent) have 99flake ron fuel. It might give me an extra 10-20 miles per tank but thats not worth the extra money imho.

[TangoAlpha]

It might give me an extra 10-20 miles per tank

200 miles per tank, extra 10-20 miles = 5-10% increase in miles

My local Tesco last night...94.?p for standard, 99.?p for 99ron = 5% increase in cost

but thats not worth the extra money imho.

[james141]

It might give me an extra 10-20 miles per tank

200 miles per tank, extra 10-20 miles = 5-10% increase in miles

My local Tesco last night...94.?p for standard, 99.?p for 99ron = 5% increase in cost

but thats not worth the extra money imho.

I found the Tesco 99 stuff gave me much less out of a tank than V-Power and the car didnt seem to like it as much

[tangerine_sedge]

CLICKY Courtesy of JT

Personally, I don't see any difference either in Performance or mpg when switching to 'better' (i.e. more expensive fuels) for my NA. I try the better rated fuel occasionally just to try it out, but I remain unconvinced to date. I'd like to see similar testing for the NA

[james141]

CLICKY Courtesy of JT

Personally, I don't see any difference either in Performance or mpg when switching to 'better' (i.e. more expensive fuels) for my NA. I try the better rated fuel occasionally just to try it out, but I remain unconvinced to date. I'd like to see similar testing for the NA

Surely you must notice you get more miles out of a tank with this stuff?

It is really noticble in mine usualy an extra 20-40 miles out of a tank.

[slindborg]

It might give me an extra 10-20 miles per tank

200 miles per tank, extra 10-20 miles = 5-10% increase in miles

My local Tesco last night...94.?p for standard, 99.?p for 99ron = 5% increase in cost

but thats not worth the extra money imho.

no gain or loss so no point sweatting like a chimp if you cant get 99ron lol....
plus my refuels are calibrated perfectly to the milage from tescos normal fuel so that its either my house or at work that needs to be filled. the 99 throws that out and needs a refill mid journey lol.

[JimmyJamJerusalem]

Personally I've been using Optimax and Vpower for ages, and find I get loads more miles per tank, and it performs so much better when you give it some welly. For those uncionvinced, go back to the start of the thread, and read the report. It's all there in black and white.

[TangoAlpha]

I've now gone from Optimax to Tesco99 mainly due to Thorney's report, but also because of the price difference.

[JimmyJamJerusalem]

I've now gone from Optimax to Tesco99 mainly due to Thorney's report, but also because of the price difference.

Is the Tesco fuel cheaper??

[Tolksee]

Yes.

[TangoAlpha]

I've now gone from Optimax to Tesco99 mainly due to Thorney's report, but also because of the price difference.

Is the Tesco fuel cheaper??

Optimax seems to be around 102p and Tesco99 is around 99p

[tangerine_sedge]

CLICKY Courtesy of JT

Personally, I don't see any difference either in Performance or mpg when switching to 'better' (i.e. more expensive fuels) for my NA. I try the better rated fuel occasionally just to try it out, but I remain unconvinced to date. I'd like to see similar testing for the NA

Surely you must notice you get more miles out of a tank with this stuff?

It is really noticble in mine usualy an extra 20-40 miles out of a tank.

I didn't notice the extra mpg, as it's too variable and depends pretty much on my driving style, i.e. a few spirited blasts soon changes the mpg Typically it varies from 150miles to 190 miles out of a tank depending upon how I drive, and how low I let the gauge go (usually re-fill at 7 litres). If there was an improvement, then it wasn't noticeable.

The point is that neither of the engines tested were the 2.2 NA. As Evo found out in their testing, some engines respond to the better fuel and others don't. Currently, I have no evidence (either through proper testing or through experience) to justify the more expensive fuel.

[theotherjonnymac]

I would not spend money in Tesco because I do not agree with their ethics. However, I do use V Power and feel the car runs better on it than the standard stuff.

[EdButler]

Just to add, Octane has no real resemblance to Fuel Economy as it doesnt determine the 'energy per litre.' It is simply how retardant the fuel is to combusting, hence preventing knock and allowing the piston to fully compress before ignition. VPower/Optimax, BP Ultimate and maybe Tesco 99 will however have additional agents in the fuel to increase the energy content. As high performance engines generally have a lower compression ratio 9/10:1 rather than the 'optimum' 12.5:1 for 95RON to release its full energy, they add substitutes (similar to methanol-4.5:1 and ethanol-7:1?) which brings down the compression ratio and ups the energy content. If the engine has a low fuel-air mix configuration, the 'good' fuels probably wont make a difference at all! Someone with a Chem Degree told me that so there may be some holes so please dont if im a little out

[TangoAlpha]

I would not spend money in Tesco because I do not agree with their ethics.

Care to expand on this?

[siztenboots]

I think after a little research on IR tax , you will find that Tesco gets a big subsidy from the government for using bio-ethanol in their fuel. I am not convinced by their green claims, I am certain about their profit margin increase. I thought that ethanol has less chemical energy by volume, and so you will get less mpg. But ethanol does have some advantages for knock retardation in FI applications, on the down side you might notice your engine runs much hotter as a bad side effect. Frankly I would rather p*ss in my tank than put ethanol in my engine.

[EdButler]

I think after a little research on IR tax , you will find that Tesco gets a big subsidy from the government for using bio-ethanol in their fuel. I am not convinced by their green claims, I am certain about their profit margin increase.

I thought that ethanol has less chemical energy by volume, and so you will get less mpg. But ethanol does have some advantages for knock retardation in FI applications, on the down side you might notice your engine runs much hotter as a bad side effect. Frankly I would rather p*ss in my tank than put ethanol in my engine.

Ethanol has more net energy per Litre than Gasoline - 3MJ/L as opposed to 2.92MJ/L. And like in my above post, it helps lower the optimum compression ratio, so really its a good thing.

Isnt there a 280bhp Exige that runs on Bio-Methanol? Thats probably the most economically viable future for biological fuels as there is already a transportation infrastructure intact for it.

The only problems with these fuels is "anols" (Methanol, Ethanol etc) evaporate very quickly. This is probably why high quality fuels 'go off' relatively quickly

Edited by EdButler, 01 August 2007 - 04:22 PM.

[robkindred]

Dont forget your ecu needs resetting for a change of fuel, otherwise going for 99ron etc will make no difference. Read this somewhere on here.