What's the most efficient way to run the AC in my car?
In my 2007 Subaru I can set the temperature to 65 F and the temperature will reach and stay at a comfy 65 degrees. But I imagine the A/C compressor works in an "on/off" sort of way and that the temperature is being maintained by mixing cold air with warm air. Therefore gas is going toward running the compressor to create cold air that isn't being used. Is this a correct understanding of the system? And if it is, does that mean it would be more efficient to run the AC on full blast, turn it off when it's cold enough, and repeat? Or is the difference in gas consumption negligible and not worth thinking about?