So I'm previously a volt owner and used to the electric vehicle quietness and road noise from tires in all electric mode. When driving my FFE I hear an increasingly load sound from the rear tires as I increase my speed. Bouncing between D and L has no impact on the sound so I don't think its related to regen. I've had the vehicle for a little over a year and am embarrassed to have thought this was normal for the FFE just not as well sound isolated with the hatch in the back. However yesterday I got a flat tire on my passenger rear tire and noticed that I've worn through the radials on the inboard side of both my rear tires. Does the FFE with increased battery weight that does not shift with fuel load naturally ride different or is this my Certified Used Focus coming with an alignment problem that used up my tires while I thought the sound was normal.