is that 20.4km/l a calculated value or a have u practically seen it? i mean, did u calculate that ur car should give 20.4 km/l or did u fill ur car up, drove it atleast a 150-200 kms and then refuelled it to calculate ur consumption? I have to personally sit in the car, drive it and then refuel it to believe its consumption. Not possible, man, unless ofcourse u did what Hash4u suggested! lolssss. maybe ur car has hybrid engine!