i do about 160 mi/day 2-3 days a week, but not all in one go, since i'm driving to and from a couple different places. i drive less the other days, but always over 60 miles. i don't mind the driving so much as the TIME. that's like 3 hours of your day shot sitting in the car. i like to drive, but i could better spend the time doing homework, playing music, being with the gf, or just sleeping. plus that's a lot of gas and scheduled maintenence costs (since you have to take the car to the shop like once a month for scheduled services). also, my insurance went up when they found out i was putting ~30,000 miles a year on my car. the only saving grace is i drive a reliable car, so it has not caused any problems since i started driving so much. actually, it's been more bulletproof than ever (just topped 180,000 miles this week), which is further impressive since i drive the FVCK out of it.
as skoorb said, it gets old fast. i will be moving this summer to cut down my driving, although i'll still drive a lot.