I usually do 10-15mph over on the highway if I'm out of the left lane (55 or 65mph limits). In the passing lane, I usually do 75-80+. If I get a straight stretch of road I might go up to 90. I speed a lot, but I do it carefully. Try to keep behind someone going faster, don't lead the way, back off the gas as I go past high risk areas for radar traps, watch ahead for cars braking with nothing in front (like they just saw a cop car), etc.

A week or so ago I had a good run with a 960. We were probably doing 75-80 through traffic until we hit a sharp curve in the highway that dropped the speed limit by 15, and I didn't really slow down, so that was the last I saw of him. Then last week there was a rental van doing around 90, so that made a great rolling road block for radar traps. And the best one was the dark-tinted Lexus I saw a couple weeks ago. It had big chrome wheels, gold trim everywhere, and it was doing at least 100+mph because I bumped my speed up to 90 and he was still pulling away easily.