There has been alot of debate on this subject on all the forums I belong to. The only conclusive test for me is that I like my tonneau simply for the fact that I can put items in my truck bed and keep them dry and "out of site out of mind". Does it save me $ in MPG? I don't really know. If it does it would take a very long time to save me enough money to pay for the cost of it. I think its personal preference as to whether you like them or not. The debate will continue on I'm sure.
