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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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2012 Chevrolet Cruze Eco 6MT
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