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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
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I had a 1989 Buick Park Ave with the 3.8 and 30mpg on a trip was no problem.
Probably the best engine GM made. I sold it with 270,000 on the clock still running like new.
I really miss that car...
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