Miles Per Gallon (MPG) is a measure used to evaluate the fuel efficiency of a vehicle. It indicates how many miles a car can travel on one gallon of fuel. A higher MPG means better fuel efficiency, which can lead to lower fuel costs and reduced environmental impact. MPG is commonly used in the automotive industry to help consumers compare different vehicles. For example, a car with an MPG rating of 30 can travel 30 miles on one gallon of gasoline, while a car with an MPG rating of 20 will only travel 20 miles on the same amount of fuel.