I have a 7th gen manual vti 2006 petrol driven. It has clocked 156000 kms on odo and kept on factory specifications. In a city like Karachi, where the traffic is mostly a mess, the car gives me around 12-13 kmpl with ac. Please note that i am using caltex havoline 0w20 fully synthetic.
On the other hand my tenants have a 2012 manual 8th gen vti hardtop. It has clocked 50000 kms and is honda maintained throughout. They dont get anything above 9 kmpl.
@abuzerkhan can guide you further. He has a vti oriel prosmatec 2005