Keep track of gallons burned, not MPG.

[jkp1187]

A suggestion: right now, Fuelly is using the MPG and L/100km as the basic units of measurements for fuel economy. But the truth is, fuel economy isn't primarily about the type of vehicle being driven, it's about driving smart.

A driver with a 20 MPG car who commutes 20 miles per day round trip burns only one gallon of gas. A driver with a 40 MPG car who goes 80 miles round trip in her commute burns 2 gallons. People who drive long distances inevitably look better than people with short commutes that overall burn less gas, but have a lower MPG ratio.

I suggest that Fuelly emphasize this point by including the total number of gallons burned, along with the avg. gallons burned per day on the Fuelly Badge. After all, the best way to save fuel is to burn less of it, not to hit an arbitrary MPG figure.