FWIW, my tow car is an ancient Volvo wagon that got 23 mpg on the
mountain grade tow mentioned in my last post. The Volvo has a long
overhang, which means I don't tow above 70, but that's fine by me
(I've been busted twice in Calfironia for high speed towing), and I
can sleep in it. Not elegant but a mostly reliable efficient road
warier.