I have a 2019 with 11,000 miles. I previously had a 2010 legacy in which I ran with a mismatched tire. The transmission needed to be replaced about 10,000 miles later. I blew a tire last weekend 0n the Forester and could not get identical replacement. The original tires are Firestone, the replacement is a Goodyear. Treadware is w/in 2/32. I went in to Subaru Dealer and they said I can run with mismatched tire. Manual says tires have to be identical. Because of my experience with the legacy I am very leery of running w mismatched tires but I have it in writing that I can run w the mismatched tire. There still is 4 yrs or 40,000 miles on Warranty so should I just let be or spend the $250 for a matched tire.