Is it possible that filling at one station does not get your tank as full as filling at the other station?
Notice any difference in the way your car runs?
From personal experience, I have seen gas in cars (ethanol blends) that was fine after a year, but that is mostly due to vapor recovery systems. Leave the gas cap off and you would have real problems with the same gas.
Underground storage tanks generally do not see any significant difference in temperature regardless of ambient variations and they are fairly well sealed from the environment.
I buy the cheapest gas I can find, last two tanks were Wal Mart at $3.289. Plenty of traffic there since they usually beat the other local stations with the 15 cent a gallon discount, although I have bought gas out in Gloucester county for the same price from a Shell station.
regards
Mech
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