And even if the gas as delivered was top quality, that does not mean that it will be that way when pumped into your tank.
You don't want to be the last car to fill before the tank is (near) empty, and you don't want to be the first to fill after a tanker refill, when the sludge that's usually sitting at the bottom of the station tank is swirled up and going into the fuel. This is especially true for ethanol-mixed fuel.
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