Here is how they do it!
Studies show the average truck owner drives 18,000 miles per year. At 15 mpg that comes to 1,200 gallons of gas.
At a minimum 10% savings you would save around 120 gallons a year (and many reports show it to be more like 12%).
You can see why it would not take too many months to have your new tonneau pay for itself.
MORE INFORMATION: http://truckstuffdirect.com/extang-solid-fold-tonneau-cover/