It's in the Rota-Disc Elite brochure on the 5th page. If you dont believe the statement get a Geringhoff head and try for yourself. It is true that they require less HP than lawnmower style heads.
I would have to argue, we went from a 8 row G to a 12 row Deere on a 9860 and didn't notice any difference.
Gerringhoff vs JohnDeere cornheads
