i've got a set of wheels that i think i'm going to throw some free R888's on. they have decent tread left. i only drive the miata about 2000 miles a year. yes, i know these are "R" compound race tires. Rev limiter and all, how much wear do you get out of them? i really don't feel like buying a new set of tires if i have these R888's for free, but then again i don't want to blow through a free set of tires just to save money. make sense what i'm askin here??