Not half! Have just come back from SE London to Devon at the weekend. M25 drivers are absolute numpties with their lack of lane discipline. Why do they stick in lane 2-3 doing 50-55mph, refuse to pull into the almost empty lane 3-4 to allow you to pull out from lane 1 to overtake the big heavy in front of you? M5 is generally ok, south of Bristol but anybody wearing a trilby or pork pie hat also has no lane discipline. And why is is that we vanners who generally occupy lane 1, tend to get there quicker because there's hardly any other traffic in it? Then when you do try to overtake them, they suddenly see a van in their mirrors, which they don't use the rest of the time and speed up. I try to use my car's cruise control, setting it at 62-3 mph to allow for a legal actual 60mph. This is the most economical speed as the car's auto box just slips into 5th and gives us 24mpg. However, this is very difficult to maintain due to other driver's complete inattention to their speed, and a twitchy right leg!