Bro millege has been rwsuced because of cng use
Cng makes engine valves seals a bit hard and dry which results in tappet displacing and poor yield
It has two ways to improve it
First one is replace your throttle body along with spark plugs .get tappents adjusted and add a little quantity I mean very minute quantity of mobil oil in your fuel
Other is replacing head valve seals or replacing the wngine head
Sent from my GT-I9300 using PW Forums mobile app