Anyone know why my bike runs rough and gets bad fuel mileage after it warms up to normal operating temperature? I am only getting 31 to 33 mpg. The bike runs fine for the first 15 or 20 minutes then the sound changes (gets louder) it gets a rough choppy feeling and loses power in all gears at all speeds and sucks the gas down. Seems like it is a sensor or something, I have no clue. Any ideas?

09 Street Glide
Stage 1 upgrade
Slipons, AC and PCV

 

I'd be looking at downloading another map.