Quote:
Originally posted by Av1ator:
Let me throw one more log on this fire.
Maybe the ones that are getting really poor gas milage are ones that have low compression problems and don't know it yet.
My milage certainly got better after they put the new top end on it. Last tank I got 17.8 mostly interstate at 70 MPH..I do have the automatic transmision with adventure package. I have really tried to get better milage by watching the speed and the best I have seen is 18.2. Maybe with careful driving the smaller tires and the 5 speed you can break 20 MPG but I wouldn't have the patience to do it everday.
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Interesting thought, but the PCM will start registering misfires, and turn on the MIL light, as soon as there is any notable wear in the intake valve guides of cylinder one. In addition, a rough idle should start quit soon after the MIL light comes on.
If you drive with the misfires, it might affect mileage enough to be noticeable; not sure.