Hi, I have 07 Mariner Hybrid which now has about 12000 miles on it. It is a great vehicle. As most of you know all of the Ford Hybrids did not offer a climate control until the 08 model year. My question is does the temperature control (cold-heat) have an effect on the use of the air conditioning compressor and the overall gas mileage or does turning it up for less cooling only brings in more outside air? I suspect that the compressor continues to run as long as the gas engine is running, but I do not know that for sure. I would like to think that turning the temperature control up for heat saves some horsepower and gas. Any ideas?