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for a high performance engine you shouldnt hesitate to use vpower or ultimate as higher octane = higher performance..but dont expect immediate results. it has to run through yer engine for a few tanks i believe but aye u get more mpg but u pay more so cost wise it works out about the same as the crap stuff if u talkin long term plus it burns cleaner and thus keeps the engine in better shape...from what i hear the stuff they use in japan is all round about 98-100 octane level..... think of fuel in same respect as alcohol...most people just drink beer and alcopops which is ok and will get u ****ed eventually but tan a bottle of jack d or vodka and u get utterly smashed although a little more expensive