Isn't the corner dueling gas stations and their business all about the flow of traffic? I usually hit the easiest when in a super congested, everyone stopped at lights, no one can get across/out of side driveways entrances etc.
easy access is key when driving home from work in a crowded area and ya need gas.
traffic study could show more people drive X way home, therefore the gas prices would be higher in that direction...etc. well, sounds good anyway :)