Questions about tires not lasting long enough

Questions about BFG Sport tires not lasting long enough

Hi All

I'm writing to ask about some tires I bought, BF Goodrich G Force Sport, for all 4 of my wheels at 255/45/17. They are all the same size so that I could rotate them, which I did every 4K miles. However, the tires didn't even last 10K miles. They already need to be changed. Discount Tire gave me credit back on them because they didn't last long enough and I got some other tires on order, Michellin Pilot Sport. I don't race at the track or on the street. I rarely drive hard on the car at all since I baby her all the time.

Did anyone else have the same experience with these tires?

Is 10K the normal life of tires on Cobras? My factory BFGs lasted 17K and my BFGs after that lasted 12K.

Did I make a good decision on going with the Michellins?

Can anyone think of a reason why this happened? Do I need to rotate them more often?

Thanks for any advice. I wasn't planning on having to change the tires so soon. I can see the wear, so it's not like Discount Tire is trying to pull one over on me. The tires actually do look like they need changing.

The wear was in the center of the tread on all the tires. I haven't had my allignment checked lately, so could that be it?