Excellent work IvanK, thanks.
One thing, you may actually have almost identical results for the various MerlinIII aircraft because the fuel gauge reads out in whole gallons and, for instance, you may have used 6.45 gallons on one test and 6.5 on another. Result: 6 gallons and 7 gallons.
If you like you could use my Performance mission for the tests, get the zip file from post #1 in:-
http://forum.1cpublishing.eu/showthr...712#post451712
It gathers the data in a .csv file including fuel reserve as a 'system' parameter rather than the fuel gauge reading. That is in kgs of fuel and the script converts that to gallons (2 dec places) and litres (1 dec place) in the results data. There are Performance.mis files for various aircraft, you just copy one as Performance.mis, run it and select one of the aircraft already in flight, there are aircraft at every 1000 feet starting at Sea level (well about 100ft) up to 30,000ft. Count them off from the left-hand one (sea level)
phoenix, mixture parameter is only available as a Control setting, i.e. no more use than the graphics/control icon. As IvanK says it should be Auto-Rich or Auto-Lean.