That seems a little low. I might put in ~12L at ~200kms of mostly city/hwy (60%/40%) riding. Burning, say, 16L of fuel (17L tank; want to leave a little for reserve) should net something more like 260-270kms.
My FZ1 will do 260-270km, would imagine the FZ8 to be better than that. That number drops significantly in the city with heavy acceleration.