Carb Icing
One point that I haven't seen mentioned here (unless I missed it in skimming) is to do with the balance between carb heat and mixture.
Aero piston engines are intended to run rich to keep cylinder head temperatures down (reliability deemed more important than economy for aeroplanes). Applying carb heat makes the mixture richer still because hot air is less dense than cold. The risk at high power setting is therefore to overrich the mixture causing cut-out, and so should be avoided.Hence the carb heat tends to be placed at the manual discretion of the pilot whilst in cars it is either set as a seasonal adjustment under the bonnet, or more likely these days it is thermostatic.</p>