Just completed LHR-ISB through M2. Mine gave economy of 16.8 - 17.0 km/h (noted when needle exactly @50% mark: 370/21.5 = 17.2), speed range 110 - 140kms, mostly 120-125 kms, without AC. 3 passangers, luggage 2 suitcases and laptop bag, stock plugs, mileage 4900.