A fellow I know who tows stock trailers likes the Chevy with the vortec as getting the best milage for towing. There is also the no longer made Ford 460 engine that gets a consistant 8mpg, whether you're towing a house trailer, gardeners trailer, or no trailer at all either up hill or on flat ground. Imagine how easy it would be to know how much your trip is going to cost you in feul before you leave the gate?
Don't skimp on GRVW on your tow vehicle---make sure it at least matches or even better exceeds the required recomendation. As far as fuel economy goes, I doubt if there is a truly satisfactory solution other than maybe a team of Clyesdales. We get 23mpg not towing and about 13mpg with a small loaded stock trailer when using the 'buran but it is seldom used as a tow vehicle (it's real purpose in life is serving as a Girl Scout Troop hauler arounder.)
An older. smallish diesel firetruck would make quite a statement. You could gear an empty tanker like that so that you would probably get excellent milage with something as light as an airstream in tow(I'm talking cruising the interstate with the engine at idle)---plus the red truck with gold pinstripe against the polished. aluminium airstream----wow!
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