[CapriRacer]

I suspect part of the rear tire wear is the inflation pressure. Going up to 3 bar is going to make that worse.

The other part of the wear picture is that it is a drive tire. Certainly rotating tires front to rear will extend their life.

Edit: Oh, and I looked up the MR2 in my books and found that a 2001 model did come with the tire sizes listed. But the wheels are indeed different. 6 front / 6.5 rear. I don't know how that may affect things, but you'll want to think about that and maybe even do a trial fit.