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after_shock
Original Poster
7,747 posts
89 months
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The other week when everyone went mental and all the fuel ran out I was resigned to filling the tank (from empty) with tescos 99 ron fuel (sorry cant remember the name of it!) as nowhere had V power in stock.
As ive not had this car long ive only really filled it up a handfull of times, all the times though have been with V power except this 1 off with Tesco.
Now I was averaging an MPG of 24.7 overall before and I easily managed 300 miles to a tank of fuel.
With the Tesco stuff in, I did a long run out and back, another motorway run today and no as in zero town driving. The big run out I did was in the rain and very heavy rain so it was driven very easily.
In total on Tesco I managed to squeeze 214.53 miles out of the tank before the very low fuel warning thing came on, which it was squeezing it out as I didnt dare go any further. After re-filling with V power today and getting how many litres etc I used this works out at a real world average of 19.15MPG!
The journey I did today at my destination is where I filled up with V power and headed back home on exactly the same roads, for nearly the full journey I was playing with a Golf R32, nothing daft but a bit of fun and after 27miles I got home to see the computer was now saying im averaging 27.9mpg!
Was it a bad batch of Tesco's fuel, am I just imagining it or is it crap? Who knows!
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gsd2000
9,775 posts
52 months
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The Tesco 99 stuff I believe contains a fair amount of ethanol to bump the octane rating up. Ethanol burns faster than petrol hence why you burn more fuel, but the ethanol helps offset a tiny amount of the carbon emissions
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Black VXR
472 posts
132 months
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It will likely ruin your engine
Only use branded fuel - Shell, Esso etc as they have the approperiate additives to protect your engine
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after_shock
Original Poster
7,747 posts
89 months
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gsd2000 said: The Tesco 99 stuff I believe contains a fair amount of ethanol to bump the octane rating up. Ethanol burns faster than petrol hence why you burn more fuel, but the ethanol helps offset a tiny amount of the carbon emissions For 80miles range difference in a tank screw the carbon emissions, will just burn a few less logs on the chimnea on a night lol
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after_shock
Original Poster
7,747 posts
89 months
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Black VXR said: It will likely ruin your engine
Only use branded fuel - Shell, Esso etc as they have the approperiate additives to protect your engine Fortunately didnt drive hard on the stuff when it was in. I religiously use V power on all the cars except the Rover and even only use Shell's normal stuff in that, as had no choice was only reason I had to use it! After what ive found out will never touch the stuff again.
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pah250
1,668 posts
24 months
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If I understand correctly, it takes the ECU a good 2 or 3 full tanks before it fully adjusts its timings to take advantage of any changes to the octane rating in the fuel. It may be that the results you have seen are not true world if the ECU in your engine is used to burning V-power 98RON and hasn't had enough time to adjust its self to Tesco's 'special brew' 99RON. Not that I'm one to diss as I genuinely appreciate it when people take time to try a little bit of scientific testing on matters like this, but I don't think you should read anything into this result unless you first give the engine a good 2 or 3 full tanks of the Tesco stuff before then beginning a comparison. But otherwise, it's an interesting result. 
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007 VXR
51,349 posts
56 months
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pah250 said: If I understand correctly, it takes the ECU a good 2 or 3 full tanks before it fully adjusts its timings to take advantage of any changes to the octane rating in the fuel. It may be that the results you have seen are not true world if the ECU in your engine is used to burning V-power 98RON and hasn't had enough time to adjust its self to Tesco's 'special brew' 99RON. Not that I'm one to diss as I genuinely appreciate it when people take time to try a little bit of scientific testing on matters like this, but I don't think you should read anything into this result unless you first give the engine a good 2 or 3 full tanks of the Tesco stuff before then beginning a comparison. But otherwise, it's an interesting result. Tescos and V power are both 99ron 
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after_shock
Original Poster
7,747 posts
89 months
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pah250 said: If I understand correctly, it takes the ECU a good 2 or 3 full tanks before it fully adjusts its timings to take advantage of any changes to the octane rating in the fuel. It may be that the results you have seen are not true world if the ECU in your engine is used to burning V-power 98RON and hasn't had enough time to adjust its self to Tesco's 'special brew' 99RON. Not that I'm one to diss as I genuinely appreciate it when people take time to try a little bit of scientific testing on matters like this, but I don't think you should read anything into this result unless you first give the engine a good 2 or 3 full tanks of the Tesco stuff before then beginning a comparison. But otherwise, it's an interesting result. Its a weird one to answer, certainly saw no performance difference at all. However using the average mpg on the display it simply would not go above 21mpg average on that on the tank of Tesco's, plus after about 5miles of driving back on V power the average was already starting to click back up. Also the total miles achieved is not a good sign for tesco's fuel, I have got over 300miles per tank and on every tank with Shell then a one off tank that just manages over 200 stands out a bit. Anyways im not a chemist so have no idea whats going on lol
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Granby
1,310 posts
84 months
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I found the same with my old scoobie, always got less range on tesco's 99 than v-power or optimax as it was before
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MyM8V8
6,796 posts
64 months
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Just remember that driving in heavy rain will require more effort(fuel) to overcome the extra resistance. That is a big difference though! I have used both and have never had such a difference.
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badboyburt
1,048 posts
46 months
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Black VXR said: It will likely ruin your engine
Only use branded fuel - Shell, Esso etc as they have the approperiate additives to protect your engine So the likely part isnt true is it, Ive run my 8 on Momentum since June 2009, the 1st owner also ran it on Momentum from new(Known as T99 back in 2007) no issues at all, if you could explain exactly what damage it could do Im sure a lot of people would be interested.
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kierancameron
238 posts
34 months
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Black VXR said: It will likely ruin your engine
Only use branded fuel - Shell, Esso etc as they have the approperiate additives to protect your engine who do you think make supermarket fuel? tesco don't have a refinery last time i checked lol yes they get it made with bioethanol to up the octane but i can't see a 20 odd percent performance difference between them.
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after_shock
Original Poster
7,747 posts
89 months
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MyM8V8 said: Just remember that driving in heavy rain will require more effort(fuel) to overcome the extra resistance. That is a big difference though! I have used both and have never had such a difference. It is a big difference, could it be a one off? Not sure. If I ever get stuck for V power again will give it a go another time. Would try BP's stuff but the car doesnt like it, can tell straight away when put it in!
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Gary H 2008
2,257 posts
58 months
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Black VXR said: It will likely ruin your engine
Only use branded fuel - Shell, Esso etc as they have the approperiate additives to protect your engine I'll be a little less polite than Burt. With all due respect, You're talking complete and utter Bollocks. HTH
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richie slow
5,742 posts
33 months
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When the supermarket petrol damaged everyones' engines a few years back it was traced to a cheap batch from a dubious continental origin. Makes you wonder....... 
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zip929
555 posts
46 months
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Brand snobbery in action.
I have used Tesco 99 on all of my cars along with Shell Vpower and BP Ultimate.
There is no discernable difference.
My cars have have all run very well on either tipple.
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AR
852 posts
93 months
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Never noticed a difference myself, could be a placebo effect thing.
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StefanVXR8
2,335 posts
67 months
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I have Tesco Momentum in mine at present as I couldn't get V-Power which I normally run both our cars on.
I've noticied no difference in mine but I run on LPG so the petrol is only used in mine to start and when I run out of LPG.
Stef
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neiljohnson
8,556 posts
76 months
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I have a focus rs & have posted & asked about this many times my car runs perfect on v power & also runs ok on normal shell fuel although I won't drive it hard on this due to risk of detonation on momentum it will not idle when cold the problem will start as soon as I fill up with tesco s  t & immediately stops once refilled with v power I have been told (not sure how true) that tesco along with other supermarket brands basically purchase the s t then put additives in it so it burns better & sell it as petrol where the bigger brands produce their own stuff so have a better control over quality keeping the good stuff themselves & selling the crap onto others.
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Magic919
7,536 posts
70 months
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kierancameron said: who do you think make supermarket fuel?
tesco don't have a refinery last time i checked lol yes they get it made with bioethanol to up the octane but i can't see a 20 odd percent performance difference between them. Greenergy make the Tesco Momentum.
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