Honda city IDSI 2005 model milage issue

[qazishoaib334]

Assalamo Alaikum. I am using honda city ids 2005 model since 2019. Before changing spark plugs from denso iridium to NGK iridium it gave 17+ km/kilo in local and 25+/kilo on long route on CNG but now when spark plugs changes to NGK iridium its local milage drop to 12 hardly on cng. What is the possible reason. I already done tunning but still same issue. Thanks for your suggestion in advance

[hash4u]

new plugs?
as per one of my friends who runs a workshop market is flooded with fake plugs
try to arrange kabli plugs in condition and recheck

[qazishoaib334]

Thanks brother. Sorry for clearing new mean Kabli. Mechanics told me yeh engine se nikalay hay shoba bazar se.

[dani_kk]

Bus phir plugs ka hi kamal hai. Buy brand new ngk plugs from a licensed dealer.
And I've been recieving complains of fake plugs in peshawar. Few days back a guy sold them for 20k for Mark x, they didn't have same text and poor ceramic seal and low quality metal tip. Orignal ones are for 48k so buy oem ones for your car. They must be in 11-12k price bracket.

[qazishoaib334]

Thank you so much for your nice and detail suggestion.