I recently ( 6 weeks ago) bought my first 650 that was sitting for 3 years. Dead battery, fouled plugs, stale gas and expired inspection. Put in new battery, new plugs, Seafoam & fresh gas added to what was in the tank. Been riding it since then and put around 900 miles on it. Added a GPS, throttle lock, trunk and saddle bags & phone charger. My question is...Would 49.8 MPG on a trip be good? My wifes 400 Burgman got 69 MPG. Also can I remove any sound deadener from the muffler without cutting it up?