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I think that it is just the normal 3.8 that was tuned had lower compression and a turbo. There are several people that get 38mpg highway with a 3800 and a supercharger, most of them get better mpg as they add power but only on the hw, city driving mpg nose dives. Look at pontiacbonnevilleclub or bonnevillepro one on them has a post on mpg.
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