Fuel Use Increases With Speed (Score 1)

That chart is disinformation, although driving patterns might produce such a skewed result. Old Consumer Reports included mileage charts for each vehicle tested: in five MPH increments. Fuel economy always went down as speed increased - even from 25-30 MPH. The mechanical (friction) load increases in a linear manner, which is not too bad - but the wind resistance increases with the square of velocity, eventually becoming the overriding factor.