I have an '04 V6 auto 4WD xCab. I have towed two different campers with it. Early this year I was pulling a 16' Scamp (2000-2500#) and got around 16 mpg. Now I have a 19' Scamp (3000#) and now get just under 15 mpg. I drive 60-65 mph on interstates, and 50-55 mph on highways.
One trick I found useful. I had a fiberglass cap. Leaving the lid up made a nice poor mans deflector. I could actually feel the 16' pull a little easier. (Moot point with my 19' as it's a fifth wheel hence not cap friendly.)
The cap-lid-up trick might help with Air Stream or other campers. Why? My understanding is that once the truck cab pushes air up over it, the cap keeps it up smoothly, then the deflector helps it blend into the slipstream of the camper better. With the lid down the air going over the cap wants to drop immediately behind the truck. Then the camper leading edge has to lift that air back up again. That's my understanding anway.
Happy trails,
-Bob
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