I always do a bit over the speed limit, usually about 5 mph over. If I'm on the highway and headed home on leave the speed limit is 70 mph, but i usually do 75 or 80 mph. It's about a 11 hour trip doing the speed limit, so with my speeding and barely stopping, I make it in about 9 to 9 and a half hours. I just can't stand when slow people are just holding steady in the fast lane.