I travel 66 at least a couple/few times a week between the Beltway and Route 29. I tend to know where the troopers sit waiting for speeders so for the most part I don't. I just cruise along at about 60 and never (ok, almost never) more. That being said, it's tough because I'm being passed by every other car on the road. But that's ok because at least I look good in my XF!