Hi,
manual CNG kit perform fine.
It depends upon your car. 1.3 or 1.6
for 1.3 auto transmission,which i hav converted, it does 100 km with a/c in city and 160 km highway at speed of 120.
Slighty reduced for 1.6
Acceleration is all fine ..as good as stock,but properly tunned.
About all good advancer setting and fitting will keep you car running good..
any thing else,i'l be there.
Regards