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Many newer systems do control the duty cycle. Old ones would just mix in some heat from the heater core to moderate the cold temperature - not ideal. I'm not exactly sure how ours work. Do you have a scangauge or something? You could watch the GPH as you adjust the temperature and see if it changes, or if it cycles up and down.
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11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
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