My 2010 RAV4 (4WD limited) turns 10 years old next month and just started on my 3rd set of tires. I took the spare tire cover off to take a look at the original full size spare tire. It still looks brand new! I only have to fill it with air every 2, maybe 3 years. However, I've read that you should never drive on tires over 10 years old. How long before you think I should just replace it with a cheap full size tire? Of course, if I needed it in an emergency I would never drive more than 10 miles or so. Is everyone else just keeping their original full size spare? Thanks!