Not really one single thing that I pick based on, at least around town where I've been to all the stations at least once and tested a tank or two from. My selection process goes something like this...
1 - Quality - if the station has poor quality fuel, I'll never go there (again), regardless of cost or convienience.
2.1 - Cost - knowing the quality is good, I'll go to the cheapest station...depending on my schedule.
2.2 - Convienience - convienience trumps cost if the difference is less than 4 cents per gallon. It also trumps cost if we're in a rush to get out of town. I'd rather fill up at a local station that I know than to take my chances at an unknown station in BFE Virginia. I'll also fill up at a more expensive station that's on my route out of town, rather than driving further into town to fill up on cheaper fuel, and then coming all the way back to leave town.
I'm not too far away from attempting to make my own fuel. I think I'll buy an older diesel to try the first hundred or so batches on though.
