Gidjit's AC compressor doesn't engage unless I push the AC button to "ON". Otherwise I just get cool fresh air from the outside. I've run the AC through the summer and experienced 36MPG on average. When the weather cooled to below 70 then the AC was turned off and my MPG jumped to 39-40. It's been raining alot lately so that requires me to run air through the defrost to keep my windscreen clear. I'm still getting 39-40 MPG.
Remember that turning the ac on and running the defrost vent will clear away the condensation the quickest as the air has been dehumidified by the a.c.
That's a good point. Thanks