Quote:
Originally Posted by d.delano
To correctly determine fuel economy, fill your tank. Reset your trip odometer. Drive until you need to refuel. Fill your tank again, and divide the mileage on your odometer with the number of gallons it took to fill up your tank. The result is your avg. fuel economy.
Honest John's method includs a .22 multiplier to convert litres to gallons to arrive at MPG rather than LPG, so take note.
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^^^On THAT tank only.
"Average mpg," can only be learned through several tanks - reason being you will load various amounts of fuel each time you fill your tank, and, driving temperatures/conditions vary tank to tank.
Cumulative mpg over many tanks is the only way to deduce an "average" mpg.