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Old 06-21-2014, 03:08 PM   #4 (permalink)
ksa8907
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Join Date: May 2012
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Volt, gas only - '12 Chevrolet Volt Premium
90 day: 38.02 mpg (US)

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90 day: 132.26 mpg (US)

Yukon Denali Hybrid - '12 GMC Yukon Denali Hybrid
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Like others have stated, not likely related to engine on coasting. My immediate assumption is that it is a result of the car being 15 years old and only 110k miles. Perhaps the car made a lot of short "cold" trips during it's life.

Either way, good luck with the replacement. Hopefully it improves your mileage!
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