[I]Dear Brother ! It was during a short trip of 30 Kilometers, at speed 80 km/hr, on G.T. Road in morning time with less traffic. These are ideal parameters to get good average.
[/I]Achieved 21.8 Km/L, at G.T. Road during a trip of 250 Kilometers, at speed 90 km/hr.
Achieved 17.8 Km/L, at Motorway during a trip of 380 kilometers (Almost) at speed 120 ~ 130 Km/hr. ( Please note Econo Mode switches OFF on Auto when speed exceeds from 115 Km/hr.
Normal City drive 16.8 km/L, without A.C. with A.C. 14 ~ 15 Km /Hr.
So in short ideal speed for good mileage is 80 Km/hr.