@Temojin
Sir your car is almost 200kg lighter, another reason could be the driver is new and either he does not know how to shift or the right shift pattern.
Maybe the car is not as well tuned on CNG as yours or the guy was hesitant to race because of the size and price of car or the car engine has not completed its tolerance limit.
1ZZ FE is the best 1.8L engine anyone can get in any imported or local car available in Pakistan.
The power to weight ratio of 6th Gen VTI is much better then new Altis.
Regards