With Cozy Euro on '09 G-5 using mostly 2-lane twisties, usually running 40 to 55 mph I am getting 60 to 65 mpg. This is with cargo up to about 75 lb on about 30% of time. The rest of the time I am solo but with the sidecar. Running 55 to 65 with no passenger or cargo for about 75 miles plus another 75 miles at the above load and speed, I got only 55 mpg. higher speeds will cut mileage. I think if I could stat in the 35 to 40 mph range with easy acceleration, I could probably get to 70 mpg or so, but it probably will not happen. GA-DK