thanks! its actually quite scary because the flight manuals are all based on new acft operating at optimum conditions-and the figures given there are often far off the mark.going by the book,for example,a 2.2hr flight at density alt of 10000' with one t/o and 1 landing gives something like a 5.8 gph consumption as an average,whereas in reality in the conditions i operate under,you're looking more at an actual measured consumption of about 7.8gph!