Barely 3-4 tanks of fuel.I didn't notice any change at all, not that I really pay attention to mpg anyway, lol. It's just a slip on, you are not changing enough to really effect anything other then looks, sound and weight. You might get a little power and may lose .5 mpg but not significant enough to even think about. Im.still breaking in the bike with about 450 miles on it now. My mpg have been around 35 to 38 but I'm very heavy on the throttle and haven't done a lot of highway traveling yet.
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But I too doubt this would decrease mileage.
and you have a lot of break-in to go! (It just gets better).