Although there is no official definition for high mileage, a vehicle with more than 100,000 miles would be considered a high-mileage vehicle. Some cars may be capable of reaching 200,000 miles or more.
Some older vehicles may be classified according to the amount of miles the car has been driven rather than the age of the vehicle. Odometers in older cars didn't even measure mileage beyond 99,999. Upon reaching such a high number, the odometer would simply start over at zero. Although mileage alone does not determine the value or condition of a car, it is a contributing factor. Many cars that have reached 100,000 miles have been properly maintained, allowing them to reach such a high number of miles.
As automotive technology improves, modern vehicles may last as long as 200,000 miles. In addition to technology, budget-conscious consumers are also hanging on to their vehicles for longer periods of time rather than getting rid of them to buy a new vehicle. Therefore, it may not be long before 200,000 miles is considered high mileage.