i agree with u dan, only thing i was talking about is to me ( a owner of a stock R33 gtst) i dont think its worth it 2 pay $1.28+ a litre for me to drive my car around town when in actual fact im not racing any1 or trying to get my car down the strip quicker or gain more h.p. for round town driving, so i wouldnt buy it, there is no need for me to atm. but if i was on the dyno or trying to gain power, drags, etc i definately would try it. its gota make sum difference over all.