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Without confusing the issue I have just shut down the 777-200 Cleared for takeoff (KSEA) default completely cold including fuel isolators OFF. Saved the flight then taken a look at the *.flt file - the mixtures are as above in my post: MixtureLeverPct=0.99615478515625 At no time has my (B777) system saved the mixture as: MixtureLeverPct=0.0

With the 777, the MixtureLeverPct=0.99615478515625 never changes, even when the 777's Fuel Control Switches are OFF (and save the flight). In other aircraft (including most add-on jet airliners), when you turn those switches to the OFF/FUEL CUTOFF position and save the flight, the MixtureLeverPct entry is MixtureLeverPct=0, but even if the addons don't do that, they are still capable of turning the mixture ON. Those aircraft CAN be started in FSX even with my default flight being the C172 cold and dark with the MixtureLeverPct=0 setting. The Captain Sim 777 is the only addon aircraft, that I can recall at this time, that I must use CTRL+SHIFT+F4 so the engines can be started. One other jet (which is NOT an addon aircraft) that doesn't start unless I use CTRL+SHIFT+F4, is the default Acceleration F/A-18. Guess who made it? That's right, Captain Sim did! :o

The point is that IF the MixtureLeverPct setting =0, then the 777 won't start. The Captain Sim 757, 727, 767, 707, B-52 and 737 all start even if the MixtureLeverPct setting IS =0, but not the Captain Sim 777.

Just out of curiosity, do a test: Edit one of your CS777 cold and dark saved flight (FLT) files. Change the MixterLeverPct to MixtureLeverPct=0. Now try starting the 777's engines and let me know what happened. ;)