Even used the lifetime CPM of a Ram EcoDiesel won't match an early HPCR CTD. Shorter life and higher operational cost. Fuel cost is not enough of an offset.
FWIW, another Texan with a perfectly sorted Airstream and an ED sees about the same mpg as I do. My rig is comsiderably longer (63') and two tons heavier. He travels at, IIRC, 63/5-mph and I travel at 58-mph. His is more aero and has a far better trailer suspension.
A better bet is a TD in a car pulling a 16-22' Airstream. Now you're at 30-mpg. P
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