Does the Brumby Evolution come fitted with a mixture knob?
The Rotax, 75% power of Max continuous is claimed to burn about 19 L/hr (+/-1), and I have seen this myself so sounds about right.
A Lycoming O-233 with the 116HP engine, at the same rated power (0.75x95) is producing 71.25 HP. This is 61% power for the "old" Lycoming.
Now if and I say if this little baby Lyco behaves itself, it should produce all of those 71.25 fillies on a computed 18.92 LPH.
Damned that data yet again! And all this on moderately low compression pistons too.
So even if you said it was a bit heavier, and you were near the MTOW, leave some fuel behind, it does not need to be full to have great range.
I think from what little I have seen, and I was promised a fly in one but will have to redeem that offer, it is an outstanding LSA. Not as pretty as some but far more practical.