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I've noticed on my 2008 Chrysler Hemi with cylinder deactivation I can't get a good economy reading when in 4 cylinder mode. It will go own to 7-12 mpg when it kicks in. In my mind I just double the reading but that's probably not right as the volumetric efficientcy probably isn't as good in 4 cyc mode compared to 8 cylinder. At least at the end of the day when filling and hand calculating mileage I always beat the indicated average on both the torque app and the onbaord computer. Have you checked the computer vs actual?
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