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Give incentives and training to the drivers, mainly let them know they can shut the dam thing off every time they exit the seat. Aero the trucks. I think Cummins already does everything possible within the law to keep efficiency on the cutting edge. I would bet any gains from other injection adds comes from leaning out the mixture and sending NOX emissions up. If your ok with that just gut the DPF filters and add an aftermarket tune and accomplish the same gains for much less.
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