I don't really understand your point. If someone takes the same car and follows the same route and gets the same results, then it's going to prove the reviewer

I don't really understand your point. If someone takes the same car and follows the same route and gets the same results, then it's going to prove the reviewer correct. If repeating the trip by someone else who isn't trying to wreck the car gives different results, then that is very much a valid point here.