I think you all are not understanding what Bob was saying. I think what he is getting at is that if the steady state mpg at say 20 mph is 115 mpg, and the guys got 170 mpg at an average speed of 20 mph than driver skill is worth 170 - 115 = 55 mpg. OTOH if they got the same or less than steady state than they might as well just have set the cruise.....

How I'd do with the translation to normal people talk?