Is it just me or is the "number of tanks" in the mileage database a useless number. Ideally, you should be able to multiply the number of tanks by the tank capacity and get the number of gallons used. Then dividing the miles driven by the number of gallons gives you average mpg. But, working backwards from the average mpd and miles driven, the tank capacity comes out different for every vehicle within the same type and the number is also therefore different from the stated tank capacity.

Clearly, the "number of tanks" figure is just the number of times the car was filled up without regard to how much fuel was actually put in.

Wouldn't it be more useful to actually replace # of tanks by actual gallons used, although you can back calculate this from the average mpg and miles driven.

Sorry for raising this issue if it has been discussed before.