Illustrated: fuel consumption at higher speeds

[MetroMPG]

via Green Car Congress:

The editors at the German weekly Auto Bild recently ... published ... a head-to-head comparison of the fuel consumption of 16 different models of cars under higher speed driving conditions.


The editors measured fuel consumption using on-board computers at speeds of 80, 100, 130, 150, 180, 200, 220, 250 km/h and at top speed.

Adding a rooftop bicycle carrier to the BMW 530i Touring model increased fuel consumption by 11% at 100 km/h (62 mph). That gap increased to 26% at 180 km/h (112 mph).

[MetroMPG]

Your grain of salt: if you read the numerous replies in the comments at GCC, you'll see quite a few Prius owners contesting the FE stats as presented in the article.