I would guess you can't beat putting that into a motorglider and go as far as you want.Since weight, maximum speed, and stall speeds are defined in Part 103 it would seem that one of the last measures of performance would be climb rate. Of course, I would want to go up to the maximum speed .....while sipping 2 to 3 gals of gas per hour .......but with a limit of 5 gals.....how long can you fly and how far can you go? I'm glad we have ability to fly under Part 103 rules and can have something that is more than just a powered kite.
I guess what I am really interested in knowing is this; Which airframe can maximize a 1/2 VW performance and provide the operator with an a good experience in efficiency, reliability, speed, climb rate, etc......pick the performance factor that suits your mission.
The Hummel Ultracruiser appears to be in the top of the list, so far.