Dude,
U got a great quality bike
The main jet in the carburetor of GD110 is of "100" number
Replace it with Main Jet (09491-92005-000) of sprinter (Cost Rs:115/-) having number "92.5".
U will find significant difference in the fuel average
Also please try to travel @ around 40-60 Km/hr for better fuel average.
Regards