If you could find a way to measure expected range and consumption rate that
would be helpful. There is a parameter called tsfc (thrust specific fuel
consumption factor) that can be added to each of the jet engine definitions in
Aircraft-yasim/747.xml.
<jet x="-2" y="12.65" z="-2.41" mass="8000" thrust="63737" tsfc="0.5">
Decreasing the tsfc should decrease fuel consumption. Adjust it up or down until it seems to be consuming at a correct rate. It'd probably be easy enough to estimate the rate you should see if you know the range of the aircraft and how much it should use to get up to cruise. Let me know what you get so I can add it to the config file in cvs.
According to this site tsfc for the C6 80C2-B1F is: 0.564
http://www.bh.com/companions/034074152X/appendices/data-b/table-2/default.htm
Erik
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