Graham, my guess is that it wouldn't be too difficult to fettle the engine to achieve NA figures +
Can't imagine why NA figures would be more than EU? Is it just an NA vs ROW and thus lower figure would be ROW's lower fuel rating?
I have to say that my surprise is similar to yours BtG.
The USA has some of the toughest emissions regulations in the world (predominately due to California) and the fuel isn't the best quality; therefore, I'd expect to see lower output, not higher.
As before, I can't comment on the power delivery of the Hog-engine, nor can I comment on a better choice of engine because my knowledge of bikes and their engines is limited; however, the concept is very exciting and I understand that the development car is an absolute hoot to drive (and very rapid).
