MPG, which is short for miles per gallon, is a measurement of a vehicle's fuel efficiency. However, there are several synonyms that can be used instead of MPG, such as fuel economy, gas mileage, and fuel efficiency rating. Each of these synonyms effectively conveys the same concept, which is the distance that a vehicle can travel on a gallon of fuel. In addition to these terms, there are also various units of measurement that can be used to express fuel efficiency ratings, such as kilometers per liter or liters per 100 kilometers. Ultimately, regardless of the specific terminology used, fuel efficiency remains a key consideration for many vehicle owners looking to minimize their environmental impact and save money on fuel.