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THe Airstream supplied figure is that it takes 20% less fuel to pull one.
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It has been estimated that a 10 percent reduction in Cd can lead to a 5 - 6 percent improvement in fuel economy at highway speeds and a 1 - 2 percent improvement at urban speeds. (source: http://72.14.203.104/search?q=cache:...22miles+per+ga llon%22&hl=en&ct=clnk&cd=2)
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http://ecomodder.com/forum/showthread.php/side-mirror-drag-effect-fuel-economy-quantified-95.html#post936
This suggested 40% improvement, but over what? 0.50 ==> 0.30, or 1.0 ==> 0.60?