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My gas-purchasing locations are chosen by which one has pay-at-the-pump.
BTW, this seems like a good thread to mention the myth that higher octane gas = higher performance. I know a lot of people who think that and who spend the extra $ on premium when regular is all that's required by their car. Higher octane does NOT equal higher performance. Higher octane actually equals lower performance because it burns slower. You need that in high performance engines because the compression is greater than regular engines, which can cause predetonation (pinging), damaging your engine.
If your car calls for 87 octane and you haven't done anything like supercharge it, and you put premium in there, you actually damage your engine by accelerating the buildup of carbon due to incompletely-burned gas. Eventually, you'll make your engine require the higher octane just to run right.
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