Forum Discussion

ShinerBock's avatar
ShinerBock
Explorer
Oct 20, 2020

Why diesels are most efficient around 1,800 rpm

Finally got more of an answer to why all diesels are most efficient around 1,800 rpm. In comparison to what I thought, it has more to do with how diesel burns than other things like compression ratio...
Tow Vehicles
4x4ord's avatar
4x4ord
Explorer III
Oct 20, 2020
patperry2766 wrote:
I know on my 2018 Ram I get better MPG at 77-80 MPH which puts me in the targeted RPM range. Seems like lower lugs the engine


I certainly believe you get better fuel economy at 80 mph and 1800 rpm than you would at 90 mph and 2025 rpm. If you found your Ram got better fuel economy at 80 mph and 1800 rpm than it did at 70 mph and 1575 rpm than I'd be willing to bet there is more to your story than what you are reporting.

About Travel Trailer Group

44,030 PostsLatest Activity: Feb 06, 2025