ShawnB

Because you have an 06 hch, could this be your situation? I pasted it below. Also included the link......

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This was the 62 mile bug.
Zero one of your trip meters.
Drive for the best MPG you can - like drive on a flat highway at 55 MPH for 61 miles.
At about mile 61 notice the MPG meter.
Starting at mile 62 start driving to get VERY bad MPG, like racing up a hill for a few miles, or start and stop driving in the city, flooring the accelerator with the AC on.

If your car was one of the ones that had the bug and the bug is not fixed you will suddenly get MPG that is VERY low, like 20s or 30s.
This is because the bug makes it start averaging from scratch at about mile 62 even though the MPG meter continues to advance to 63, 64, 65 etc.
So even though the meter is displaying, say, 65 it is only averaging together the last 3 miles of driving.

If your car never had the bug or the bug was fixed your MPG will go down but not as drastically (maybe only around 10 MPG lower by mile 65.)
this is because it is operating correctly and averaging ALL 65 miles together, the 61 good ones and the 4 bad ones.
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http://www.greenhybrid.com/discuss/r...hlight=61+mile