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Old 08-06-2015, 12:14 PM   #6 (permalink)
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Join Date: Sep 2010
Location: Denver, CO
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Colorado - '17 Chevrolet Colorado 4x4 LT
90 day: 23.07 mpg (US)
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Be wary of OBDII tools, especially the ScanGauge. The Chrysler designed CAN bus is very busy, and adding tools into it via the OBDII port often causes the transmission computer to trip out. It can be disconcerting to have shift points disabled while driving.

A 2006 CRD probably does not have the original shift points. They were "upgraded" due to the torque converter being inadequate to handle the low rpm torque of the diesel engine, that could be one contributor to your poorer fuel mileage. I had a 2005 model with the lower shift points and routinely got 30mpg on the highway, if I kept speed at 65mph or below, making sure the tranny was locked in top gear - for the old shift points this happens at 57mph, later flashed up to 61mph.

Make sure you have a clean air filter. The CRD has a very small filter, same size as the 3.7 gasser and should be changed often, sometimes less than 10k mile intervals.
I'm not coasting, I'm shifting slowly.
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