Im sorry but Im just buying the "top tier" classification...Ive got a car that Ive run nothing but Shell gas for the first year...untill the knocking and pinging, then I switched to Chevron because I was told this was happening to me because of "bad gas"...and realize I only frequent the newest stations or the ones with the newest tanks....certainly Im partially to blame(driving habits, short trips) but Im not totally convenced detergents arent to blame as well.
{quote]Buczynsky says the exact cause of engine deposits is not known. Gasoline contains over 200 different molecules, and so far, no one has isolated a particular brew that is more likely to cause engine deposits. GM and other manufacturers, however, noticed there were regional concentrations of fuel-system warranty claims and traced the problem to the fuel.[/quote]
Oh no? They dont know what causes these deposits? Well how bout examining the deposits and figuring out this is a by product of in that chain of 200 molecules! I thought these companies employed chemists and engineers?
I personally think gas quality(across the board, manufacture to manufacture) is (currently)crap! And that we the consumer are going to pay the price at the pump as well as at the service department...and friggin detergents arent the ansewer, they are part of the problem! Give me real gas!!!