Quote:
Originally Posted by skyking
Regarding the OP:
I lump it in there with other misguided generalizations. My favorite one is " my car gets better MPG @70 than at < some slower speed >.
Modern engines are not very sensitive to small changes in RPM. What happens is they get a good tank or two, maybe downwind and downhill 
That becomes the new standard and they would rather drive faster than do some real sciencing :P |
Surprisingly I tested a Mercedes Benz E220 D and it genuinly had its best fuel economy at 110 km/h (just under 70 mph).
That was 4,7L/100 km (50 mpg)
However it is a rather aerodynamic car with a 2,5L turbodiesel and very tall 6-speed manual.