depends on the brand of car but the average miles put on a car in 1 year is 8000 to 12500. a car that has been properly taken care of and maintained at 70000 miles is still being broke in. ford had a truck that ran for (if im not mistaken) 1250000 miles on the original motor and tranny. this is because it was taken care of properly. such as oil change every 3k miles. that kind of thing.