The thing about that graph is that fuel is in the denominator, the "Gallons" in Miles/Gallons. So while it looks like things are leveling off, the gallons per mile are really going ballistic as the speed increases. For example, those two dark blue dots in the lower right represent a %37 drop in fuel economy. And it is %270 worse fuel consumption than at 50mph.
Does anyone NOT know what a denominator is?
