Posted by jdemaris on March 23, 2008 at 10:11:48 from (72.171.0.148):
In Reply to: Re: OK - I'll buy it posted by Hugh MacKay on March 23, 2008 at 09:51:36:
Back in the 70s, there were many service trucks around with tractor diesel engines in them - especially Deere and Detroits. That is probably the reason why Dodge tried a few Deere engines. None got anywhere near the mileage you posted and some were tested and recorded carefully.
I've heard more BS stories with diesels and mileage than anything else. 35 MPG (US) Suburbans with 6.2s, Ford F250s with 6.9s getting 40 MPG (US), Dodge-Cummings getting 35 MPG (US), etc., &c. All a combination of wishful thinking, BS, or - a one time trip with a 60 MPH wind blowing at the back of the truck.
I used to think the claims were at least - amusing. But after many years of trial-and-error, doing thorough research on diesel specs, spending time trying to verify high claims - I now just find them irrating - and insulting to anyone with good diesel knowledge.
Again, there is nothing special about the 404 Deere. It gets mid-range efficiency for its design. A turbo-Cummins beats it at all RPM ranges. So, why doesn't a Dodge-Cummins truck with a 360 c.i. , 5.9 liter turbo-diesel get at least as good, if not better then your friend's claim? Easy answer, it never happened.
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