Most of the talk on leaning and mixtures relates to high altitude / density altitudes due to summer and heat. In the winter, our DA can often be -3000'.
When in cruise (and of course at takeoff/landing) should I remain full rich due to the nice "thick" winter air? What other considerations with mixture may I be missing in winter?
(For example's sake in a C172 or any similar carburated fixed pitch aircraft)