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+1
Although I have never owned one I think that the 3800 is one of the best engines ever built across all manufacturers.
Its not totally inconceivable that lowered restriction could help MPGs but the CFM increase from a K&N when considered across the whole system would not be big enough to raise your MPG a measurable amount. Pulleys are another matter. I suspect your MPG success was more due to the latter combined with superior maintenance and efficient driving.
If intake airflow is a problem, I would look at modding to put in a larger filter before going to an K&N on a gasoline engine because K&N dont actually filter that well.
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