Let's just say for the sake of argument that the Tornado does work and can produce a few mpg increase over a vehicle without it. What's stopping Ford, or any other auto manufacturer, from molding in an OEM Tornado into the intake of every vehicle they manufacture?
Absolutely nothing.
The Tornado is unpatentable. Anyone who wanted to use such a device could do so for free with no licensing fees to pay the holder of the patent. If it was effective, for a few cents worth of plastic, they could gain an instant fuel economy advantage over every auto manufacturer who failed to do the same.
The fact is, you don't see these from the factory because there is no valid scientific evidence to prove they are doing anything beneficial. Put the Tornado in the same category as HHO generators.