One of the comments that they made about the performance of the Sprinter towing the Vintage Airstream took me by surprise. They mentioned averaging 9 MPG on the trip from Iowa to California with the Sprinter/Airstream combination. As light as the 1948
Airstream was, I would have expected the towing economy in the low teens rather than single digits. My Suburban with the 7400 VORTEC would have averaged around 12 MPG with an Airstream of that size on a similar route and my '75 Cadillac Eldorado would have averaged around 9 MPG with an my Minuet which would be heavier than the 1948
Airstream by a few hundred pounds.