psfred

I agree with you that many American Diesels are set up to emulate stationary engine setups, but this is pretty much exactly what an over the road diesel truck engine is. It should be designed to run in a narrow RPM band and perform in a fuel efficient manner when operated in the "sweet spot"

I'm perplexed by your assertion that American Diesels are not efficient. My 7,000 lb Dodge/Cummins 4X4 pickup truck will return an honest 21-22 MPG running empty and 16-17 MPG towing a loaded car trailer. These figures compare pretty favorably to say an 87 W124 Diesel sedan that might get 30-31 MPG.

I don't have BSFC figures for am OM603 but I would bet they would not be significantly better than a Cummins B.

Tim