For exemple, on the C 172 G 1000,if during the take off, the air/fuel mixture must be adjusted at 100% when the altitude of flight is between 3000 et 6000 feet, what would be, in principle, the setting of the command of mixture and also the setting for the landing ? thank you for answer .
You should lean above 3000ft.
Not everyone knows how to lean properly or that you may need to repeat the process duriing a climb. You gradually lean the mixture and revs will gradually increase whilst you do so. Keep leaning until revs begin to drop again then slightly enrich until you reach peak revs again.
That’s the way I always used to tune cars with those old-fashioned carburettor things many years ago.
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In the G36 you lean based on EGT, not revs. I’m using the WT Garmin mods, as well as the G36 mod, so I don’t know if this is the default but there is page in the Garmin especially set up for this. Makes for a more interesting climb out anyway 
In a real 172 you run full rich at take-off power to protect the engine, it runs cooler at full rich. It is not an altitude related thing, it is a full power thing.
The 3000’ figure is a rule of thumb you can (and may sometimes need to) lean at a lower altitude.
It does seem like you need to lean the mixture a lot more in the sim than you would in a real aircraft .
Hi
How lean should you go 75 50 percent
Depends on altitude mostly. You need to find the Operating Manual for the aircraft you are flying to see how to lean it out. In the G36 it is based on EGT for example, i.e. you lean out to find the peak EGT and drop back on the rich side by 25C or so. I tend to do this above 3k, then repeat every 3k or so until cruise. On descent you must go full rich before landing - there is even a placard on the G36 which says this. As for the 172, sorry, I don’t fly that but I am sure there are 172 experts out there that can advise the correct approach for that aircraft
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You can cheat by enabling auto mixture seeing what sort of settings the game uses then turn auto mixture off again.
But basically in something with no EGT you pull the mixture out till the revs drop or it runs rough then push it back in a bit. Slightly richer than the point revs drop off.
Thanks for that I do mainly fly Beechcroft B58
I do lean at the start of 3000 feet but stop at about 10,000 normal it’s around 50% about 2400 rpm
Well don’t worry about it, because the mixture doesn’t do anything in that plane. It’s a known issue. It’s locked on permanent auto mixture and there’s nothing you can do about it. The only thing that works with the mixture level is fuel cutoff. Otherwise it’s like the lever wasn’t even there.
This is an excerpt from an older variant of the Cessna 172, but it should still be close to how the newer version should be leaned (would be nice if Asobo provided us with some manuals, mind??).
Now the above would be a great thing to show you if the piston aircraft in this sim were realistic, modelled correctly and not underpowered (which they are not).
So despite what I’ve pasted above, you’d probably be better off following a more rudimentary method to leaning a piston aircaft, such as below.
At altitude, set cruise power.
Lean by reducing the mixture gradually until the engine runs a little rough. You may see a slight increase in rpm before the engine starts to roughen.
Slowly enrich the mixture until the engine smooths out. This is what’s known as a “best economy” setting.
If you need to climb, enrich the mixture before adding power if at or above 75-percent power, then lean again at your new altitude.
I fly the C172 G1000. For local flying, below 3,000’, I basically adjust mixture two times, per SOP. Three times if flying above 3,000’:
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After engine start, I set power to 1,200 RPM, then lean until I see a rise in RPM. Leave it there. This is done to minimize plug fouling, especially during extended ground operations or long taxi times.
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The airport I fly out of is at 1,400’. To properly lean before takeoff, we go full power, and for temps below 90F, we lean to the top of the green band on the fuel flow gauge. Above 90, about 1 bar above or “richer” than that. This provides the best RPM for takeoff and operations below 3,000’. I keep the mixture here if I’m staying local and below 3,000’. Above this altitude, you lean as required according to the charts.
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For descent and landing, I’ll adjust mixture as required if descending above 3,000. For local flights below 3,000, The mixture stays where it was set for max power on the ground, which is what I’d want available for a balked landing or practicing Touch and goes.
Found a good video on mixture basics and why it is often done wrong.
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If you aren’t not so picky with realism and want to make it easy for yourself there is a game command for optimal mixture depending on the altitude you fly.
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