Quote:
Originally Posted by wind.zero
 - Fill up your fuel tank all the way
- Drive your car as you normally would and let your fuel tank deplete
- Fill up your fuel tank all the way again
- Record the amount of fuel it took to refill the tank
- Look at the number of miles on the trip odometer
Here comes the tricky part ....
Divide the number of miles on the trip odometer but the number of gallons/liters off your fuel receipt. This yields your MPG or MPL.
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Bingo! I remember my grandpa kept a little book in his shirt pocket for JUST calculating MPG. Some times the new way isn't the best way.