Ride slower. Lean out the mixture, best way is to monitor with a EGT, plug color and seat of the pants.
I have been playing with an 08 TNT, trying to fix the lean mid-range. I played with needle tapers last year. turned them down a couple thousands in diam in the lower third if the needle and went from 16 mpg to 5 with just that change. Sled ran real bad too. This year I want with needles from a 07 500ss, larger pilot, and main. My mileage went from 16 to 10, the temps were a little cooler, but the milage was unacceptable. The sled ran great too. I am now back to all stock, getting 15-16(20 mpg if I ride with kids at 40 mph)sled runs fine. I just watch the EGT and stay away from the hot spots.
Sorry to ramble, just giving an example. The pipes and reeds require more fuel, so on a sled that would get about 10 mpg stock(as most of the sleds from those years did) any mods will drop that number. Ahh, the price of HP!
Remeber the old saying, noise = power (maybe that only applys to Harleys)
