From what I have read the 3.8 is pretty economical for it's size. A friend had one in a Buick and always got 30+ mpg. Have you gotten a scan gauge type of instrument and gotten your tires up to the max side wall pressure. Narrower tires. Some aero tricks maybe. Drive slower and less. Changing engines is a lot of work once you consider the money and effort you will have to drive thousands of miles to break even.
Thanks for taking your turn the sand box.
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