I take strong offence to your repeated labeling of Corolla owners who run their cars on CNG as parhay likhay jahil. Just for the record, jo kehta hai wohi hota hai.
But on a serious note, you or anyone else for that matter, does not have the right to call anyone "jahil". Just explains the kind of mentality you have. Pakwheels is not a forum where people come to boost the egos of pathetic show-offs like yourself, rather it is an information spreading medium free for all; regardless of whether one drives a Mercedes S Class or an FX 800. So please do take note.
To the poster, the mileage you're getting is pretty normal. Nothing disturbing about it. I also get the same mileage on my car.