Gen Y fiver hitch increase fuel economy?

Durb wrote:
You had me intrigued so I checked their website. I can't see where they even make a fifth wheel hitch. Pin boxes yes. Hard to make claims on something they don't even sell.

They make three replacement pin boxes with gooseneck couplers. These they claim increased your fuel economy by up to 3 mpg. Maybe they figure because you don't have a 200 lb hitch in the back of your truck fuel mileage goes up???