Yeah, not dissing the Brumby, I too have inspected it and think it's a very good product. Just buy it with the Rotax! ;-)
The site says 345 empty. Assuming that is with the Rotax, then 375 for Lycoming? I regularly fill the sporty with 200 KG of people and stuff. 25 KG of fuel would have me be on reserves before I reach the edges of the Adelaide VTC in the LycoBrumby.