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 26, 2020
^^^ Shiner, if on average you are towing up a 1% grade with wind and at 65 mph you would be getting more like 6.5 or 7 mpg. At that kind of power output I would expect the transmission of a factory tuned truck to select 5th gear.

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