Tom the mechanic has went over my head but if you meant .75 gallons 43 miles/.75 gals means 57 mpg. The numbers would be more accurate if you track mileage say 150 miles then filled backup. I can make my tank take an extra gallon "for extra full" if I want. Get my point. use up 10-15 gallons then refill and do the math. Very intersting since I spent $1,500 or more each month on gas.
