Not if your ride was trying to get the front wheel off the ground. LOL !! Where he might find the extra power handy is passing on the freeway and big hills..But when you already have enough power for that it would be less noticeable..
FM is correct about the back pressure . It also helps in gas millage.
I bet most of his millage can come back by staying out of the throttle....... YEA RIGHT !!! LOL !!!