I believe the following items may affect the petrol consumption.
1. Proper run in. (
http://www.motorcycleextremist.com/Moto ... -Way!.html)
2. Tyre pressure (34-36ps)
3. Driving style (aggressive / gentle, gentle style can save petrol)
4. Rider body weight, single ride or with passenger (single ride can save petrol)
5. Road conditions ( highways or urban road, mainly highways can save petrol )
6. Riding speed (My riding speed on highway is 70-80km/h can save petrol)
7. Proper maintenance (Don't speed up / high RPM until the engine reaches working temperature, i.e. 80 degree celsius, especially in winter. Furthermore, regularly replace the engine oil, oil filter, air filter, etc.)
Any more sharing on petrol saving ?