I have the long cannons using 45's and 130's, unifilter, snorkel removed and airbox "modified" - I usually get about 45 mpg but do mostly stop-and-go riding in commuting traffic. i can get a little over 50 mpg on highway runs.
with all of that done i am somewhere in the low/mid 60's (HP) at the wheel which i believe is about 5 hp over stock since the factory hp is quoted at the crank. oh, also running 18T sprocket which probably comes into play regarding (negatively) HP and (positively) mpg. anyway I love the sound of the SS's and would recommend, especially at $275.