really uneven rear tread wear?

[Schwarzer Kater]

That's common for RWD vehicles......they go out fast and uneven. Even worse because you can not rotate due to the difference in wheels.

[UKBXSTR]

Agree with Lux - lowered suspension and excessive spacers all lead to increased tyre wear.

My Mich Pilot Sports are wearing better on the Box than the Contis did on a BMW 330 DIESEL (which lasted 9k miles in normal driving). Put Yokos on the BM and they were like new after 5k miles.

I'm reckoning on 14-15k on my rears and i do drive it pretty hard, but no track days or autocross

[graybeard]

When I asked the service guy about the correct camber on my car he told me .5 was the factory setting sure looks like more than that, but who am I to say.

A sure sign of bad alignment is tire cupping. Easy to watch for this just run your hand along the inside edge of the tire, if adjacent treads feel uneven there is an alignment problem. The tires will go fast from this point.

[FUHRIUS]

it's all ringing true...
My car is lowered 1 inch from stock s height, I run 21mm spacers in the back for a better look, I do mostly straight line 'round town driving, the engine mods that were done to this car beg for me to goose it at almost every chance I get...and the result is a set of pilot sports that have completely petered out after about 9k miles.
As I reflect on it, I'm not sure I'd change any of the above just for a little better tire wear...these are the reasons I dig my boxster in the first place!

Now it's time to figure out what my next tires will be...but I don't see any reason to abandon the pilot sports.