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what kind of fuel milage drop can i expect going from an open trainer to closed?
It depends on how you drive and the weight of the open trailer, I took a 850 mile trip with a freinds open trailer, it was empty for half the trip and we got 21.3 MPG with the air condition on towing at 67 MPH on mostly flat ground. I got 20.8 coming back at the same speed with a 1933 Plymouth 1/2 ton pick up truck on the trailer  The most MPG I recorded with that truck towing my 24 Pace enclosed trailer empty was 15.6 MPG or so, that was towing at around 55 MPH. I usually towed a little faster than that and got 12.3 to 15.0 MPG, depending on the terrain, at around 68 MPH with the car in it That truck was a 1998 1/2 Ram 2500 2WD CTD with 3:54 gears, automatic and 235x85x16 inch tires  My new truck, 2006 3500 4 wd four door with 3:73 gears, automatic, doesn't do that well  Best so far has been around 12.8 at low speeds(under 75 MPH in NV.) 
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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