I have been told that the Fuel 2006 are less powerful that the 2005. What do you think ?

The 2006's are more efficent then the 2005's. So
they tend not to sit back in the window as much.
This gives takes away some of that down wind grunt,
that the 2004's and 2005's had. But on the possitive
side the 2006's seem to have a larger wind range
all and all.