Fuel consumption refers to the amount of fuel that a vehicle or machine uses to operate. It is usually measured in miles per gallon (MPG) or liters per 100 kilometers (L/100km). Understanding fuel consumption is important for drivers because it affects how much money they spend on fuel and how often they need to refuel. Factors that influence fuel consumption include the type of vehicle, driving habits, and road conditions. For example, a sports car typically consumes more fuel than a compact car due to its powerful engine. Additionally, aggressive driving, like rapid acceleration and hard braking, can lead to higher fuel consumption.