mileage

Mileage is a term used to describe either the distance traveled by a vehicle or, in consumer context, the vehicle's fuel efficiency. In everyday usage, it often refers to fuel economy—how far a vehicle can travel per unit of fuel—while in technical or used-car contexts it can refer to the total distance a vehicle has covered, as shown by its odometer.

Fuel efficiency is commonly expressed as miles per gallon (mpg) in the United States and the United Kingdom, or as liters per 100 kilometers (L/100 km) in many other regions. A higher mpg or lower L/100 km indicates better efficiency. Fuel economy ratings are derived from standardized tests run by regulatory agencies and are intended to enable comparisons between vehicles.

Distance mileage, or lifetime mileage, is the total number of miles a vehicle has traveled since manufacture. It is tracked by the odometer and is often used by buyers, insurers, and service professionals to assess wear, remaining life, and maintenance history. Mileage can affect resale value and maintenance scheduling.

Testing and standards: In the United States, the Environmental Protection Agency (EPA) assigns city and highway mpg estimates based on specific test cycles; in Europe, WLTP and previously NEDC provide standardized fuel consumption and emissions figures. Real-world mileage can differ from lab results due to driving conditions and vehicle condition.

Factors influencing mileage include engine efficiency, aerodynamics, weight, tires, driving style, terrain, and climate. Regular maintenance, correct tire pressure, smooth acceleration, and removing excess weight can improve fuel economy. Mileage-related considerations also intersect with fuel costs, environmental impact, and regulatory requirements.