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My theory...
Big rigs engines are designed for longevity and economy -- and consequently cost more to produce/purchase. To buy the equivalent in a passenger vehicle costs at least $3000 more (diesels over gassers: specifically pickups, followed by passenger cars).
Some of these trucks stay running 24/7 until the next oil change, with an expectation to get at least 750K/1-million miles out of the powerplant. RPMs are often limited from 1,800 to 2,100 -- to stay within the powerband and for longevity.
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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