We have a 2009 Elkmont 24 and tow with a 2004 Toyota Sienna mini van 5 speed auto and 3.3 engine. The first time I took it to Florida from North Carolina I tried to go the same speed as not towing --always crowding the speed limit usually 70-75 mph. I got about 10.2 MPG. Coming back I learned to be content going between 50 and 60 averaging about 56 mph. I get about 15 MPG. Of course the Elkmont is always up and wind resistance seems to be a huge factor. Someone told me it squares with each increase in speed. I am hoping some small diesels will be out in a few years. Right now only the VW Tourareg, BMW X5, or Mercedes M class offer what I want and they are very pricey! The key is about 400 ft lbs of torque at 1800 or 2000 RPM and I think I should get over 20 mpg towing.
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