The car overheats after less time than eight k, but it wouldn't go as long as the sony. Fivea, a, seven s r lifted that which thant godha, ha. I would have been really curious to see how the r five would have performed if we had used it in place of the a, seven s three. We don't want to say it would have become a problem, even though we never had problems. But from what i've seen, you get to like, fifteen to thirty minutes and it starts to become a problem....