You know how you're already aware of how mileage works, but try to play the fuel system anyway? Finally have enough break-in mileage to open it up a little on the autobahn. I kept watching the MPG meter, trying to keep it in the 20s zone. On a 150 mile/240 km trip, I averaged 23.7 MPG, at an average speed of 125 km/h - with a few bursts to 160 km/h. This compares to 25 MPG a tankful in my normal 20 km daily commute. Still, that's pretty good if you're in a hurry.

(I know, dumb to mix units. I travel and caluclate in km, but the efficiency gauge is calibrated in MPG. Somehow I understand easier when I want a higher number, rather than lower as in L /100 km.)