well, i still doubt it... with ALL OTHER THINGS BEING EQUAL (i.e. car condition, fuel quality, driving style habits, road traffic conditions, etc.) a 1.5 will give better fuel avg than a 1.3 especially in city drive where you hardly go beyond 60-80 kmph .. i think we need more data to support our claims
hypothetically, with this logic, will an imaginary 1.8L engine ALTO give better fuel avg than the current 660 cc ALTO ?