^ this is what 2nd or 3rd Gear?
Generaly thinking your totaly right, nobody drives them more 80km/h Citi but the thing is that we were only comparing CNG consumption would be a little higher as compared to the 9th Gen Corolla. Due to the weight/lenght of the car.
We arnt talking about speed, racing etc. Its just about the consumption, as the Engine has to work slightly more then it had to in the 9th Gen Corolla.
Similarly, Swift gives way better mileage in then the Liana, Just because the same engine has to work lesser.
Thats what my point was, i have had Corollas in family since Corolla 1300 came out, So we are die hard fans to, I didnt wanted to ruin anyone saying that Corolla is a bad car, Just that i dont enjoy driving the 1.3L 10gen Corolla as much i enjoyed driving my Baleno, 9th Gen Corolla, etc 