Bro i mostly drive at petrol,and specialy on long run also,i am not deteching Cng system in my car,because i have faced several times low rpm fluctuations in car at petrol,but in every situation i had tackeled the problem,in emergency case i think there should be another fueling option is necessary in old cars,and at cng i have never faced any problem like low or high rpm,but i usually drive at petrol,
Surrely it will not harm in any thing in car by puuting cleaner in tank,in cng car?