It seems like an obvious question but I could not find the answer on google, the rotax-owner forum, nor here. What 912uls power/rpm setting gets the best range and fuel economy in a Kitfox? Has anyone collected data on this?

I know the rpm will vary from ship to ship because props vary. I have a whirlwind GA-RW3B set for best cruise and usually cruise at 5200rpm. 4000rpm is about what it takes to hold level flight with flaps off. My best guess is that my best fuel economy will probably be around 4300rpm. If nobody has any data I will probably do three two hour flights in no wind at 4200rpm, 4500rpm, and 4700rpm and see my fuel consumed and distance traveled.

I'm really interested in calculating my best fuel economy (mpg) for bragging rights with my continental powered friends