Calculate Your Car's 'Miles Per Dollar' Instead of Miles Per Gallon Miles per gallon isn't always the most useful way to think about mileage.

A miles per kWh figure is used to calculate electric car efficiency. Understanding and comparing these numbers could save you money. The post What does the miles per kWh figure mean for electric cars?

To calculate your miles per gallon fill up the car, drive a number of miles, refill the car, and divide the number of miles you drove on your trip computer by the number of gallons of fuel it took ...