Glad to learn that my review was worth reading.
Indeed, you're right, purported mileage seems exaggerated. In city driving the max i get is 8-9 KM/L.
Simultaneously I am using Elantra 2.0 NA. And OSHAN seems to be a gas guzzler in comparison with it, since Elantra gives me more than 13 to 15 KM/L on highway driving, while in City it is around 10KM/L.
Maybe this has to do with the turbocharger.