IDK, Jayson knows these kites better than me. Thing is, he can also hold down kites in a lot more wind than most.

Let's just put one of you stud muffins out on this kite come the next hurricane, get a windmeter and a video camera, and document our findings!!

Seriously though, Jay really knows how to edge a board on a C kite at it's top range.
To make it short and sweet, I would put the top end of the 7m Fuel at about the same as a 9m Waroo. I remember riding that kite in 35 and flat water, not impossible at all. BUT, if I were in chop or waves... no way. With the C's it's all about forcing the kite to the edge of the window and keeping it their at it's top end with a hard edge, not sheeting out.