Yes that wasn't on CNG:) btw who told u that i keep most of my cars on CNG. lolzz.... CNG is in my cars after 2008. Awein apne guess na marte raha karo na.
And as i've mentioned earlier, i've lot of motorway travel, far beyond than ur imagination chotay bhai. And to correct u, speed in slope can't b considered as top speed. A car running on a slope at 20Km/h in neutral gear, wud u say my car has 20km/h speed in neutral gear?
PS: This is total wrong concept that CNG has less top speed. Challenge, give me any car and after two hours ill show u same top speed on CNG and petrol