I dunno, I ride it @ 70-75 and it comes out to%% on the nose
I have knocked out the phoney flower petal centers of the baffles and rerouted the head breathers to the atmosphere
This M8 hauls the mail my 14 Freewheeler got 43 on the nose if did not twist the wick too hard
The MOCO advertises foot note #5 your results may or may not be different with mileage