I agree with Rains. when i disconnected my servo and stock exhaust my MPG stayed the same if anything it went up when i put my K&N on. now in the winter time when its cold i dont get as good MPG but that due to the computer increasing the fuel mixture to get the bike to normal opperating temp. of coarse mine never geets there cause its to cold out. anyway last summer i got another 10-15 miles out of a tank of gas with my mods.

So from my experiance NO your MPH will not drop.

 

Thanks for all your help - everything is on and working full job PCIII - KN - Muzzy Slip on. Muzzy sounds awesome taking it to get custom map and we'll see how it puts out. Slip on exhaust took the longest due to no photosw install manual from muzzy, however, between muzzy customer service and you guys it was a breeze. thumbs up muzzy. I will post the map results I am going to have it done with both stock and KN air filter.