it does not matter what is written on speedo, i wont suggest driving it above 100km/h, and it wont go beyond that.
It's got F10A (970 cc) engine. 4 cyl, 55 PS
Though i ve driven petrol version only but i ve heard its performance is not that good as far as hilly areas are concerned due to its weight and less torque offered by CNG.
actually its got the same engine what we have in Alto/Sedan but's got different transmission/diff setup.