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Old 05-07-2012, 04:34 PM   #3 (permalink)
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Join Date: Jul 2010
Location: Eden Texas
Posts: 37

Atos - '05 Hyundai Atos Prime AT
90 day: 21.33 mpg (US)
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What you say does happen. If I am at high RPM and push in the clutch and take my foot off the gas, the overrun kicks in, and I have infinite MPG until the rpm gets down to idle speed. Then I am at normal engine on coasting.
I have found that engine on coasting MPG is very dependent on your speed. This is because you are using idle fuel. More speed means more miles while burning that fuel.

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