Very easy...
A lot of fuel left in the 2,1 liter tank after 10 minutes

I would guess that you do not have a Flash... There is a small problem to use all the fuel in that tank.

We have found out that we uses half the fuel compared to a JC P120SE or JC P120 at the same flying time and type of flying.
Look at the fuel figures here:
http://www.hawkturbine.com/res/Hawk1...mance_test.pdf
and here:
http://www.hawkturbine.com/res/Hawk1...litetslage.pdf
Thats how it is possible.
Regards
Anders