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I always figured that the cap would yield better mpg too. However, at work we put caps on about 50ish 2001-2005 Ford Rangers. My buddy at work is in charge of paying fuel expenses for our fleet. He said that mpg has decreased accross the board about 1.5mpg since the switch. We still have 40 to 50 trucks with open boxes for comparison.
I think alot of it has to do with how long the box is and the shape of the cab (as mentioned above). Aparently the regular cab Rangers w/ 6 foot boxes do not benefit from the extra weight/drag of the caps. I'm sure this would be a different story on a 1/2 ton truck with and 8' bed though.
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