On a thruway/highway, if I am not on a long trip, I am content with 5 mph or so over the limit.
If I am on a long trip, I will go with the traffic flow up to about 85 mph, I don't like going faster than that (although honestly I don't even really like going that fast, I prefer 75-80 mph; you don't realize how fast even 80 mph is until you are wishing you were stopped).
