I have a 2004 Hinda Civic Exi having D15y engine with CNG installed. But i am running the car on petrol nowadays. It gives me 9 km/liter in city. I wonder if reverting it back to the original settings can make any difference. I need the original Valve settings information for intake and exhaust and also please give your opinion regarding this. Your opinions will be highly appreciated.
Sorry for getting the engine wrong in the title but i dont know how to correct it.
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