Vehicle efficiency refers to how effectively a vehicle converts fuel or energy into movement. It is often measured in miles per gallon (MPG) for gasoline vehicles or in kilowatt-hours per 100 miles for electric vehicles. Higher efficiency means that a vehicle can travel further on the same amount of fuel or energy, which can lead to cost savings and reduced environmental impact. Factors affecting vehicle efficiency include engine design, weight, aerodynamics, and tire pressure. For example, a hybrid vehicle typically has better efficiency than a traditional gasoline car due to its ability to use both a gasoline engine and an electric motor. Regular maintenance, such as keeping tires properly inflated, can also improve a vehicle's efficiency.