I'm very happy with the GP One's performance, economy and range. On both these long trips, I've been in the company of a Tecnam Eaglet and two different Rans S6 microlights - they used about 16 litre/hour. The Eaglet and GP One have a similar cruise speed, but the GP One's 100 litre wing tanks meant that I didn't need to fill up as often. The S6 is quite a bit slower.
If I'm flying in the circuit or doing local training, then the GP One is even more economical - it uses less than 10 litre/hour at 80 knots.