its the struts. my dads went bad, and so did mine. mine i let go so long it wore the inside of my tires bald lol. if you have the know how and tools to do them yourself its dirt cheap, me and my dad both got ours replaced at midas for $130 if i remember correctly. i dont really think its in reference to mileage, i think its just time. my dads car has under 70k and needed them, where mine didnt go bad till 110k. the rear shocks arent very good stock on these cars.
on a side note, midas put in Monroe shocks and they are noticeably stiffer than stock.
6000k headlights, LED license plate fog lights, tinted taillights and to top it all off, 2 12" air horns!
the gf:'00impy 3.8, every option. COTM July 2013