I don't know what kind of super efficient petrol you guys are getting in up country. My city 2002 Exis well maintained never gives over 12kmpl in city without AC. My Alto was the biggest fuel guzzler and it hardly did 10kmpl. My cultus Carby never gave anythign over 11kmpl.
I have absolutely no idea how can you people claim 17-18kmpl. Even hybrids like prius claim 25kmpl!