One extreme, hypermilers never use heat or a/c, or lights or anything normal folks do. These people are completely insane, of course, and do other things to improve mileage, like tailgating tankers by 4 feet, taking exit ramps without braking, and driving in circles to scrub off speed to avoid braking. The other extreme is a typical Boston driver, floor it leaving a red light, and locking up the brakes to stop. Unless you're in a competition, just drive normally, keep your car running in top shape, tires inflated, etc and worry about the other guy on the road. If your a/c compressor does not come on in defrost mode, use it once in awhile to keep the components from rusting or seizing.
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