Why is my Mercedes C-Class consuming more fuel than usual?

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Why is my Mercedes C-Class consuming more fuel than usual?

A sudden in fuel efficiency may be linked to weak o r carbon-fouled spark plugs. In Pakistani cities, frequent stop-and-go traffic, poor fuel quality, and short trips prevent the engine from running at optimal temperature. These conditions lead to carbon buildup on spark plugs, which causes incomplete combustion. As a result, the engine burns more fuel than necessary to compensate for the loss in power, increasing fuel consumption significantly.

Talha Kyanii asked on 10 Oct 2025 18:22:00 pm

1 Answer

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Gari Master - on 10 Oct 2025 18:23:09 pm

Poor fuel efficiency often results from **carbon-fouled o r weak spark plugs**. In stop-and-go traffic common in Pakistani cities, combined with low-quality fuel and short trips, spark plugs get coated with carbon deposits. These deposits reduce their ability to ignite the fuel-air mixture efficiently, causing incomplete combustion. The engine compensates by burning more fuel, leading to higher consumption. Regular plug maintenance and using quality fuel help avoid this issue.