[surfbeast]

Basically all gas is the same. If you live in the N.E. all the gas comes through the same pipeline and is pumped to a transfer station. Gas is refined to a certain spec so Exxon dosn't care if they get some of BP's refined fuel. They even ship the extra unleaded right behind the regular. The part of the fuel that gets mixed up, say, ( 89 / 92 ) is pumped off and sold as a feul blend. It is at the transfer station that the individual suppliers add their additives. The additives is what makes up the difference, not the gasoline itself. There is no milage difference in fuel octane ratings. The higher octane may burn cleaner but will not make your GT run better or stonger unless you have a power adder,chip or timing advance. The octane rating is just a measure of how much compression or time it takes for the fuel to burn ( can't remember wich ). If you are running a new GT then just put in 89 octane from a good brand station. Like the last post said, don't buy from a cheap station, you may get water, debris etc.. from the fuel they sell.

Sorry about the leghth, it is really boring here today, SNOWED IN