@JZ..
would u plzz recommend me best spark plugs for my corolla 09 (xli) .. it has done 32,000km.. no cng installed but now the performance of the car decreased alot i feel like i m driving it on cng :s and it is giving me a consumption of 11km/litre within a city.. i've recently serviced its throttle body but still i think its not giving me the performance that it used to give in past