I don't think that the fan on either the red or blue is a big drag, but running the compressor etc. for the AC is what chews up milage. I have heard from several sources that only about 30-60 seconds of idling to warm up the car is OK as long as it is driven relatively gently until it is fully warm. That sounds a little low to me, but who knows. If it's in the single digits or below I start it awhile before I get in anyway so I don't freeze my ass!
