I’m sure not an expert here, but I would say drive it till the wheels fall off, so to speak. at 100,000 miles, the trade in value won’t really be anymore now then later. (I think, lol!) So you might as well get all the use out of it that you can! That is my plan, anyway, with my 9 year old oldsmobile with 175,000 miles on it, still going strong! I live where there is NO PUBLIC TRANSPORTATION, not even taxi cabs. If my car dies suddenly, I can always borrow from a friend, catch a ride, etc. till I get it replaced..which doesn’t really take that long. Just wanted to give my 2 cents! Good luck!