MPG stands for miles per gallon and is a unit of measurement that determines how many miles your car can travel before it uses up a gallon of fuel. Comparing cars' MPG is a great way to quickly assess their fuel efficiency and how long you can expect the car to last before refuelling.  In addition to MPG, another great metric is the range of a car. This number illustrates how far you can drive before the tank is empty and is a unit of measurement that has gotten more relevance as it allows you to compare traditionally fueled cars with electric vehicles.