A Vango Powerex Kettle may help with the fuel efficiency with the decagon stove.
http://www.outdoormegastore.co.uk/vango-powerex-kettle.htmlI have put a spare Mil spec Trangia burner in with a
Ghillie Adventurer Kettle + Cook Kit. A 500ml Trangia bottle fits into the Chimney along with some fat wood stick + tinder + firesteel.
http://www.amazon.co.uk/Trangia-0-5L-Bottle-Safety-Valve/dp/B000AR7966/ref=pd_sim_sg_20