Thanks for the response guys. John there are some fuel planning figures similar to those you mentioned in our FLTMAN for the Arriel but the charts are very small!
I will have a look at the C model charts as CB suggested. From what you guys have said and others I have spoken too our planning figures are pretty close for planning purposes and the 94% N1 cruise shouldn't change actual figures by much.
cfr I am surprised by your comments. Maybe you need to try a higher hover height if the aircraft is moving around a lot. Not sure what parameters you have set for the Autohover. We do ours at 75-100' with not many dramas but sea state usually a bit lower.