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Old 06-11-2009, 11:50 AM   #2 (permalink)
PaleMelanesian
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Join Date: Dec 2007
Location: Texas
Posts: 2,320

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
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90 day: 44.06 mpg (US)
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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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