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.
1500 RPMs will give you 172 HP, 602 lb-ft of torque, and you will burn .328 lb/HP-HR of fuel
1600 RPMs will give you 179 HP, 590 lb-ft of torque, and you will burn .330 lb/HP-HR of fuel
1800 RPMs will give you 192 HP, 560 lb-ft of torque, and you will burn .339 lb/HP-HR of fuel.
As a recap, my engine spins 2278 RPM at 65 mph. Customer support recommended 200 rpm more than peak torque. So, it looks like I will be shooting for the 1700 rpm range at 65 mph.
Time to start calculating ratios.
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