| Sounds like a good boat cover would pay for itself in a single season.   Mike, have you noticed a difference in mileage having the topper on your truck compared to an open bed?   
exactly. i paid $135 for the cover, just a standard one from Gander. it's paying itself off pretty quickly.  
  
i haven't had a truck without a topper in years, so i can't speak to that firsthand. however, they did an episode of MythBusters about it, and used fuel flow meters on a single truck with open bed, tonneau cover, tailgate down, no tailgate, and net.  
the net was the most fuel effecient, by a decent margin.  
http://www.youtube.com/watch?v=r3aqHbD-O9E  
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