MPG, or miles per gallon, measures how far a vehicle can travel using one gallon of fuel. A higher MPG rating indicates better fuel efficiency.
MPG calculates fuel efficiency by dividing the distance traveled in miles by the amount of fuel consumed in gallons. For example, if a car travels 300 miles on 10 gallons of gas, its MPG is 30.
Manufacturers test MPG under controlled conditions, but real-world driving often yields different results due to factors like speed, terrain, and driving habits.
| Type | Description |
|---|---|
| City MPG | Measures fuel efficiency in stop-and-go traffic, typically lower than highway MPG. |
| Highway MPG | Measures fuel efficiency at consistent speeds on highways, usually higher than city MPG. |
| Combined MPG | A weighted average of city and highway MPG, providing a balanced estimate. |
MPG directly impacts fuel costs. A car with 30 MPG will cost less to operate over time than one with 20 MPG, assuming equal distance driven.
For context, the U.S. Environmental Protection Agency (EPA) estimates that a car with 25 MPG will consume about $1,500 more in fuel over 15,000 miles than one with 30 MPG.
Another myth is that manual transmissions always provide better MPG than automatics. While this was true in the past, modern automatic transmissions often match or exceed the efficiency of manuals.
Consider two popular SUVs: one with 22 MPG and another with 28 MPG. Over 12,000 miles annually, the more efficient SUV will save about $400 in fuel costs, assuming $3 per gallon of gas. These savings add up over time, making MPG a critical factor in long-term vehicle ownership costs.
When shopping for a new vehicle, compare MPG ratings to ensure you choose the most fuel-efficient option for your needs. The EPA provides detailed MPG ratings for all vehicles, helping consumers make informed decisions.