I know that Kumho's tend to wear quickly but
I ran my 18's with Kumho Ecsta MX's on my old 323 last summer and when I took the wheels off, the rear left tire was worn completely down to the belt. That was the only wheel that was like that so I suspected possible rubbing as the cause.
However, I replaced the tire and put them on my 330 a few months ago. To my surprise, the rear left tire is completely burned down to the belt again. I'm sick of these tires and I'm not buying 4 more of a different kind, so I am putting my 17's with Conti's back on for good.
Anyone else experience the same problem?