My GLi 09:
In city: 11-13 kmpl
Highway: 17-21 kmpl (140 - 100 km/h)
These figures are precisely calculated with fuel records of each refil starting from May 2011 till date.
Fuel: 90:10 :: Super:HOBC
Liqui Moly Injector Cleaner every 3-4k km
Regards ..