I have 2011 model Mehran, the problem is that, it doesn't speed more than 80Km/h on CNG. However, on Petrol it easily goes upto 100+km/h.
What could be problem? The car is totally driven just 1500 kms and 1st free inspection by Suzuki is done but they didn't do any Engine tuning / tappet adjustment etc, they just tighten the nut/bolts and changed gear oil, that's it! So you can say that till after showroom delivery that car engine tuning has never been done so far, even-though it has completed 1500 kms.
What is needed so that it can accelerate like petrol and on CNG can go upto 100+km/h. I'm not a fast driver but it really really annoying when you keep pressing the full pedal and car doesn't accelerate and give impression that "I can't accelerate anymore"