I find that leaning to the left when banking left, and leaning to the right when banking right comes quite naturally...

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...sorry...

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In my little Cessna props I always slightly lean the mixture once above 2500 feet ASL.
I pull the mixture control out until the engine falters, and then push it in slightly until the engine runs sweetly..

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If I have Manifold and EGT gauges fitted I keep an eye on them as well.
A fuel flow gauge is useful as well...

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Leaner mixture = more miles to the gallon, and a more efficient engine...

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Out of interest I found that trying to take off in a Cessna 152 from Big Bear City Airport (L35), NE of Los Angeles which lies at an altitude of 8000 Feet ASL, it is almost impossible to take off within the length of the runway, and extremely difficult to climb away...

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My little microlights cannot even get off the ground, because of the low air density...

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LOL...!
Once you are up in the air and speeding along it's o.k. at high altitudes, but trying to get started on the ground is a different matter...

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Cheer all...!
Paul...fiddlin' with his mixture control...as usual...

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LOL...!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.