[tonycarreon]

i have taken something along the lines of 10 or so long-distance road trips in the boxster and have used diverse brands of gasoline / gas shops - exxon, valero, QT, shell, BP, sinclair, murphy, chevron, conoco, sunoco, pilot, hess, sheetz... to name a few

personally i prefer exxon (though i have political objections, i "feel" the gas is higher quality - go figure) but 80% of the gas my car gets is from the local convenience store - GetGo (a division of Giant Eagle, the local grocery store) and i honestly could not tell you one tank from the next in the way the car performs as long as it's 93...

(though once i believe i got a fairly "bad" tank somewhere in oklahoma as the car REALLY did not seem to like it - very low MPG, lower "power"...)

my preferences over the years have been for:
1. exxon
2. sunoco
3. bp
4. whatever else is available
5. texaco (pre-chevron)