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You might look in the archives of Diesel Power Magazine, I remember reading an article about a 1st Gen Cummins that they purposely did all the work to make it more fuel efficient, and if I remember right, it was a stick shift and a dually at that but they took part of the duals off and used masking tape to tape the wheels smooth, I will see if I can find that article and hopefully post a link!
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Staying Focus'd on MPG
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