noun
fuel efficiency; gas mileage; fuel consumption
Refers to how far a vehicle can travel per unit of fuel, or the rate of fuel consumption. Commonly used for cars, but also for other fuel-powered vehicles.
この車は燃費がいい。
This car gets good gas mileage.
燃費を良くするために、タイヤの空気圧をチェックしている。
I check the tire pressure to improve fuel efficiency.