Anyone who rides motorcycles knows how wind resistance starts increasing significantly as soon as you get above 50mph or so. I prefer "increased fuel use" which is a fact as opposed to "waste gas" which is an opinion. :)
Power required is proportional to velocity cubed, as bicyclists know. Takes a lot more power to increase speed by 1 mph when you're riding 20 mph than at 2 mph.
(I wonder how fast Governor Warner was riding when he took a tumble this afternoon.)