Our new truck doesn't have a tonneau cover for the bed, and we're thinking that it would probably improve aerodynamic performance (and mileage) if it did. Does anyone have experience with adding one ...
I put a Access limited soft roll up cover. It fits inside the rails so I still have access to the stake pockets. There is no flopping, whistling or any noise whatsoever. Like most have stated, no help with the mpg's either. Mine is fairly weatherproof. I've been headed to camp in a rain storm, and was pleasantly surprised how dry the bed was. As far as security, out of sight, out of mind.