Quote:
Originally Posted by 99LeCouch
Yep, 3800 Series II/4T65-E combination.
The W-bodies such as your Impala are capable of getting the same mileage. First thing I'd recommend is deleting the crimp GM put in your Impy's exhaust so it's even diameter the whole length like the H-body, ie LeSabre and Bonneville, exhaust is.
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Interesting; my wife has a W body (98 Intrigue) with the 3.8. She's only gotten as high as 28 mpg with highway only trips, even with my driving. I'm all ears about this crimp in the exhaust from a GM person. I only know Fords.