Originally Posted by bambbrose
pumps should be fairly accurate as they are tested at random by the state.
How you do it, is fill up you tank, hit the trip meter.
Run until you fill up again, at that point fill up at the exact same pump you filled up before to prevent variation in pumps.
Take how many miles you drove on the trip meter, and divide it by how many gallons of gas your tank took to fill back up. Simple as that
Yup that's the best way. Make sure you buy gas at the same pump if you can. Cause a slight incline could fill up more or less in your tank.
But yes MPG will fluctuate from week to week depending on how you drive, how often you turn on/off your car, how long you sit in traffic, etc.
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