Quote:
Originally Posted by Singh
Adrian, Tesco Moumentum 99 is regarded by most on SRS as the best fuel and rated much higher then V Power. Throney Motorsport done a test with that vs V Power and T99 came out much better. Also, MRC have had cars on 95 RON on their dyno then they put in T99 and they get about 20 BHP more.
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That's interesting - my recollection of a technical article I read was that the method by which the octane is boosted is more volatile in the Tesco fuel so will go off faster and not be as consistent as fuel brewed with a higher octane in the 1st place. The suggestion being that the Tesco fuel was a 95 octane boosted up with additives rather than a genuine 97-99 octane at the processing stage. I suspect the regularity the tanks get refilled plays a big part, so a slow selling super unleaded will probably have a lower octane than you think you're getting.
Probably all marketing bollocks either way, to be honest, but I generally don't trust supermarket fuels at all unless the car in question pre-dates unleaded!
I suspect 20bhp measured on a dyno won't feel much different when you're pulling figures like these 
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