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I think it has everything to do with the superiority of a diesel engine with a manual transmission. Since a diesel has a limited rev range (the 7.3 redlines at 3K, correct?) it has to have higher gears. The impala, being a SS model, is likely designed for power and ignoring economy altogether. I'd be looking at a possible transmission swap for one that is geared more toward economy if the one you have is geared for performance. It may just need to be adjusted for economy.
A 350 in an impala screams old school muscle car, not econobox. Is it possible to force the torque convertor to lock up sooner than the speed it locks itself? Some TCs can be manually locked by grounding out the correct wire in the ECU harness.
Does the impala see mainly city or highway?
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 RIP Maxima 1997-2012
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Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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