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It does pay to try a couple of tankfuls of different brands of gas.
Three caveats
1. Never buy gas during or right after a delivery. The filling of the tank at the station stirs up any sediment and water in the tank. Right after a delivery? - ask when they usually get deliveries, observe deliveries if you can.
1. If the gas station has modern pumps called MPDs they mix their middle grades as you pump, just like Sunoco used to. One way to tell if they are mixing is if they started selling diesel without digging up the yard. (They convert their middle grade tank to diesel.) It is possible that a MPD is adjusted improperly.
3. I once worked for an independant who pumped regular into the premium tank if he was short of premium.
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2 8s & 2 7s 600,000 miles total
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