Originally Posted by Cadetgray

I burn a top tier premium. I seem to get the best gas mileage with Shell. In fact, it usually evens out the cost differential with the cheaper fuels. I never let my tank get much below a half tank. I was told by an old mechanic that it reduces the chances of condensation in the tank because of the reduced surface area and it reduces the chances of sucking in sediment that may be at the bottom of the tank. Don't know if either apply to modern vehicles, but it seemed logical. He's the same guy who said based on his 30 years of experience working on carburetors (remember those?), the two best gasolines were Texaco and Shell. I see that both make the Top Tier list.

Interestingly, there are some prominent brands missing from the current list of Top Tier retailers (Mobil, Exxon, BP/Amoco). Who would of thought that filling up at my local Turkey Hill Minit mart would be better for my engine than at a Mobil station? Guess I'll save the Mobil for the crankcase.

Here's the list of current Top Tier retailers:
QuikTrip
Chevron
Texaco
MFA Oil Co.
Conoco
Phillips 66
76
Entec Stations
Shell
The Somerset Refinery, Inc.
Kwik Trip / Kwik Star
Aloha Petroleum
Tri-Par Oil Co.
Turkey Hill Minit Markets
Mileage Stations
Chevron Canada
Shell Canada
Petro-Canada
Sunoco Canada