With respect sir.
CG nd YBR ki millage ka bht difference hy,
agr aap YBR ka fuel ziada kr den, to koi CG ybr ko cross nee kr skta,.
YBR or YBR Z usually 65+ average dety hen, (as per my own experiences)
but CG ziada sy ziada 50km / liter ki average deta hy
2nd most important thing is vibration, Yamaha 120 ki speed per bi etna vibrate nee krta jitna CG sirf 60km ki speed per krta hy.
es leay comfort factor ko bi nazr andaz nee kr skty