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Old 30 Dec 2010, 05:31 pm
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Default My 2008 Honda Civic down shifts when coasting downhill with the cruise on. doesnt this REDUCE gas...

...mileage? Is there any reason a car company would program a car to do this? With car companies trying to INCREASE gas mileage, it seems to me like this causes the opposite effect.
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Old 30 Dec 2010, 05:46 pm
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no, if the car is headed downhill and the tach is reading 2000+rpm the fuel injectors dont fire
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Old 30 Dec 2010, 06:01 pm
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The car downshifts for increased engine braking effect so that the car does not speed up when going downhill. Also, it should not reduce gas mileage by much if any, as the Civic decreases fuel injector output when coasting in gear. You can confirm this with an OBD-II sensor.
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