I have H-rated Firestone Affinity (OEM tires) on my 2015 Civic. They seemed to wear very slowly during the spring, but now that we're reached a hot summer, they are wearing much quicker. I had 7 to 8/32 at 20,000 miles and am down to 3 to 4 at 30,000 miles. Regular rotations, wearing evenly, no...