Did your fuel economy noticeably before discovering that spark plugs were worn out o r dirty?

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Did your fuel economy noticeably before discovering that spark plugs were worn out o r dirty?

Spark plug inefficiency can lead to incomplete combustion, reducing fuel efficiency. Have you noticed a sudden decline in your average fuel consumption even with consistent driving habits?

Lubaba asked on 07 Aug 2025 15:38:57 pm

1 Answer

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Car Mechanic Expert - on 07 Aug 2025 15:42:11 pm

Yes, many owners experienced a noticeable in mileage up to 2–3 km/l before discovering that the spark plugs were worn out o r carbon-fouled. After replacement, fuel economy often returned to normal, confirming the connection between plug condition and fuel efficiency.