At about 100 miles a tank, that's more like 10 tanks, but still, very low miles...
Oddly, My CB360 get's slightly less mileage (MPG) then my Nighthawk 750. I have trouble wrapping my head around it, that the 100 pound heavier bike with 2x the displacement gets better mileage.
My Cb360 gets about 45 MPG, my 750 about 47 MPG. That average...
I have had as high as 54 MPG with the 750, all highway, long trip. Never had that high with the 360.