How do You Figure Out Gas Mileage?

It’s easy if your trip meter works. Fill your car and reset the trip meter or just write down what your odometer reads. Then when you have to refill, take the number of gallons that it took to refill your car and divide that into what your trip meter reads. If you used the odometer, take the number after you ran the tank out and subtract the number from where you filled the tank. Divide the answer by the number of gallons.