Considering how many times you travel the interstate before you decide the gears once a year? Mopar nationals or a show it is not going to kill a good engine to cruise it or to hold 4K. Hell blow out the carbon I know that's what I do before going to track get it on interstate and hold it at 4K Good oil pressure and cooling system and you can drive it on a 90 degree day.I feel if it can't hold it the rev's then its time to rebuild or update.