Quote:
Originally Posted by 99LeCouch
If your dad has a 97 to about 2005 Impala, then I may have the same engine and transmission in a different chassis. 3800 Series II engine and 4T65 transmission in my car. The Impalas were either the 3400 or the 3800. The 4T65 can bolt to either.
Check the engine. If your dad's car has a black plastic upper intake manifold, it's a 3800. If it's flat aluminum stamped with "3400", it's a 3400.
If your dad is managing about 26-27 mpg highway with a 3800-powered Impala, that's about what a W-body gets.
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He has the 3800, the bigger of the two. He gets 28mpg or so according to the on board thing, I'm not sure what he gets IRL. So is ethanol not effecting him?