BossHogg
Senior Member
- Joined
- Feb 23, 2014
- Posts
- 1,932
- Reaction score
- 2,444
- Location
- Oakland Township, Michigan
- Ram Year
- 2015
- Engine
- 6.7L Cummins
For those with the Cummins engine, download the Cummins Power Spec application and learn what is the most efficient RPM for your speed and load.
https://cumminsengines.com/powerspec
FYI, it isn't a friendly app to use and requires a number of difficult parameters to get as input but the results are amazing. I use to run, while pulling my 15K RV, in 6th gear at around 60 MPH thinking the lower RPM would yield better MPG, boy was I wrong. The best efficiency is an RPM range from 1,600 to 2,000 and my MPG increased shy of 2 miles per gallon.
https://cumminsengines.com/powerspec
FYI, it isn't a friendly app to use and requires a number of difficult parameters to get as input but the results are amazing. I use to run, while pulling my 15K RV, in 6th gear at around 60 MPH thinking the lower RPM would yield better MPG, boy was I wrong. The best efficiency is an RPM range from 1,600 to 2,000 and my MPG increased shy of 2 miles per gallon.