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Old 01-09-2011, 03:51 PM   #6
dan76
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Join Date: Mar 2008
Location: Salt Lake City UT
Posts: 441
Re: Which engine to look for?

I had an 08 Sub with the displacement on demand system and found the slightest grade, use of the A/C or engaging 4WD would instantly disengage the system. As a result I did not see a fuel economy increase attributed to it's use. It sounds great in theory but I didn't experience a benefit. Perhaps during periods of extended idling it would improve fuel mileage.
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