I suppose I could be qualified as "gas obsessive." I don't go out of my way, but I do keep a running tab in my head on where gas is the cheapest of stations that I will purchase fuel from. I tend to avoid ARCO here though, as their fuel seems to not produce the MPG that the others do even though they tend to be 10-15¢ cheaper. I haven't tested them out beyond that, just my hunch from watching average MPG's. When I can, I do try to time my fillup with my bi-weekly trip to Costco, as their gas is usually cheaper than the lowest station and the MPG's are just fine.
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