I have not touched the O2 sensors on my 2011 cross bike since I bought it new. I get around 40 mpg riding the twisty roads around here and I have more than enough power. 215 miles on a tank would be around 40 mpg if it is near empty and better if it is not.
2011 Cross Roads Sunset Red
OEM short windshield, passenger backrest, crash bars, saddle bag bars, heated grips, vinyl closeouts, tachometer, ambient temp, LED headlight, luggage rack. WD lay down licence plate.