Since mechaniCally only cat con was added so maint wise all would be same
I hv initial model of efi 08 model and getting 12/13 km/ltr without AC in city....i hv nvr driven highway so cant comment, but people do claim 15/16 for all efi models
It all depends if the car was kept well and maint timely, be it 2010 or 2013
Try buying latest possible model with a lower mileage.