Miles-per-gallon (mpg) is a commonly used unit of measurement in the United States to quantify the fuel efficiency of vehicles. It represents the distance, measured in miles, that a vehicle can travel on one gallon of fuel. A higher mpg value indicates better fuel efficiency, meaning the vehicle can travel farther on less fuel consumption. This metric is widely employed in the U.S. and some other countries that use the imperial system for measuring fuel efficiency, providing a standardized way to compare the fuel efficiency of different vehicles. It is an essential consideration for consumers looking to minimize fuel costs and reduce their environmental impact, offering a clear measure of how efficiently a vehicle utilizes fuel resources.