diane, thanks for asking that question, as I, too, was wondering what I could expect in terms of mileage.

i have the conti all seasons on my crossfire and have just turned over 17K mile wise. about a month ago, i picked up a nail on the highway and need to have the tire serviced. an out-of-town 5-star chrysler dealer was where i had it towed, and once i learned it was easily repairable (though i'm still going to order a new set) they gave me paperwork which indicated that I still had 3/4 of my original tread-life on these tires. they seemed surprised! i do check pressure almost psychotically, and i'm sure that helps, but i really have no idea what to expect from these tires in terms of mileage...

granted, most of my driving is entirely highway, and i obviously pack on the miles in a commute like you and gailwrath...but the conti's seems to be doing very well for me (i suspect i'll replace them all before next winter; however, they did fine this winter in snow - though i realize this is something you don't experience).

again, thanks for asking about tires...as i've been wondering myself. bonster