Apologies for the stupid question. I know that mixture adjusts the mixture of fuel and air that's going into the engine. However, what is the purpose of this?
Does it have any correlation to altitude & air density (i.e. at altitude the air is thinner, so you need to increase the amount of air the engine is receiving in order for the fuel to continue to burn efficiently?)
Just speculation - hopefully someone can clear this up for me. I haven't been able to find a straight answer anywhere on the web.