From LEER’s website:
In January 2007, SEMA, the Specialty Equipment Marketers Association, conducted the latest in a long series of studies on the effect tonneaus have on the aerodynamics of pickup trucks. The new tests took place at AeroDyne Wind Tunnel LLC in Moorseville, NC, a site often used by the NASCAR community.
The new tests confirmed what other tests have shown: LEER hard fiberglass tonneaus reduce the coefficient of drag of a moving pickup truck by an average of 6.5%. These results, combined with recent pickup truck road testing, prove conclusively that adding a fiberglass tonneau improves fuel economy by 6% – 9%, depending upon driving conditions.
That means adding a LEER tonneau to your pickup will save you gas and money. You can enjoy all the security and style of a LEER tonneau while you put CASH back in your pocket. Your savings mean your LEER tonneau will soon PAY FOR ITSELF!