When you bought your car, you may have purchased it based on the miles per gallon it averages. But do you wonder if your car is actually getting the maximum fuel efficiency? The free app Mileage Keeper tracks your car’s fuel economy. Just enter your odometer reading, fuel amount and cost for each refueling. It keeps track of how you’re driving and averages what your actual MPGs are. This app can help you improve driving and reduce wasteful habits to get the most out of your car.