We are actually renting a car for the trip... Did not trust our car, nor did we want to put all those miles on it. So the car should be reasonably new... Also, We are driving from western new york state to colorado just past denver. I understand that the i-80 is a little dull and flat, but I don't think it will be a rough ride. We are not in a real hurry either.... Rand-McNally says it is a 25 hour drive before stops... so the three days seems like a leisurly pace