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I heard back from Cummins Customer Support today. Thought I would share this with you and for any searches in the future. Thank you for that ESN. I was able to pull up the information. It actually looks like the best RPMs for you would be about 1500-1700 RPMs. Here is what that will give you...

The goal is to lower the RPM for improved fuel economy but I don't have a base line of what the factory says it should be. The flat bed is coming off and the wheelbase is getting shortened so there will be less weight too.

Looking for a little help from anybody that has the older Cummins 8.3 (6 CTA) mechanical fueled engine. I have a 1996 Freightliner FL70 with the Cummins 8.3, Eaton 6306A, 4.33 rear gears and 11R-22.4 tires. Its current setup is a 26’ flatbed and GVW is 34k. It buzzes along at 2100 rpm at 60...