This is my DR 490 which I have carried out some work on
1) a proper seat
2) a proper drain (68mm trunk)
3) A right A frame.
I am planning to put a good size tank under the seat at some stage
I have a 60 HP etec with a 13" * 19" prop with a WOT of 28-30 KN depending on load (2 up with 60-80 lt of fuel)
Typical fuel consumption 1.5- 1.8 NM/l. I have just raised the engine by 1 hole and would expect this to improve as a result