mohsin bhai I has used 4 types of sprockets on this bike so far and yes petrol average per fark perta hai jitni bari sprocket ho gee bike utna he petrol zayada khaye gee..
35T = (CG125 Stock) Dead in accelration, Top speed Very Good goes to 114KMH with a smile(H)
38T = (RP125 Stock) Little better in accelration, Top Speed very Good but Redlines on 114~115kmh
45T = (Wheelie Users) Very Good Take Off Accelration, Top Speed Reduced and redlines completly at 105kmh
56T = (Trail Bike Stock) Brutal Take Off accelration top speed reduced to 70kmh :o
I am using 45T as I am happy with 105KMH speed as well.