Definition: Abbreviation for Miles Per Gallon. A vehicle's fuel economy is determined by a number of factors including the size of the engine, the type of carburetion used, the weight of the vehicle, the type of transmission used (manual or automatic), the final drive ratio, the size and type of tires used, tire inflation pressures, aerodynamic streamlining of the body, the driving habits of the driver, the kind of road surface and terrain upon which the vehicle is driven, the speed at which its driven, and environmental factors such as temperature, wind and humidity. Taking all these into consideration, it's no wonder the EPA says "the mileage you get may vary from the official EPA estimates."

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