I bought a 2015 F3's when they 1st came out. All my driving is short trips--never over a 150 miles & most are less than 10 miles. 2 bad health years-2 8" titanium rods in my spine-etc ++. Anyway I'm approaching 8000 miles on the original Kenda's, stage 2 upgrade on ECU & airbox, burning rubber whenever on blacktop & I have rough estimate at least 5,000 miles left on all of them. I think Kendas ran in streaks--I'm replacing the fronts with 165/60R-15 VREDESTEIN QUATRAC 5 SL because I threw a balancing weight & a new set only cost $178 + tax versus a rebalance on the old for $xx each.
This indicates I would have got close to 12K miles on the original Kenda's. Unusual huh? Still keeping the rear Kenda. I have never had a Front End Alignment & tire wear pattern appears appropriate. Thus all Kenda's must vary in quality. My top speed has been 118 mph on speedo prior to Stage 2 upgrade, police radar has become more refined.
Darrell