how long do performance tires last?

i am getting new tires soon, and i just wanna know how long will they usually last if my car is stock high? and what tire pressure i should keep to reduce tire wear?

i have 215/40/17 rims.

Tire wear has alot to do with alignment and how you drive. If your alignment is off say 2.5 degrees negative camber, 2 degrees toe-in you, and drive like a maniac all he time you will destroy your tires in no time. If you have say 1 degree negative camber and 1/16 toein, and just drive normally your tires will last longer.

If you have coilovers like I see in your sig you should make sure you get an alignment everytime you change the height of your car.

But I recommend Kumho 712s they lasted about 25-30k miles for me.

well, i am thinking about putting my stock springs back, because i really hate it when i have to get new tires every few months.... and those tires are freaking expensive too.......i really can't afford them...

Get yourself a camber kit that will fit the negative camber and will prolong the life of your tires. I would get an alignment first and then let me/us know what your specs are.