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Toyota Corolla 2001: Why is my fuel running low faster than usual?

My 2001 Toyota Corolla used to get around 500-600 km on a tank before fill-up, but more recently I have found the light comes on at about 425 km. Could this perhaps be an issue with the actual fuel measurement system, or something more mechanical?

If there’s no obvious problem with the way the car is running, it could be that the engine needs a tune-up, new spark plugs, leads, air filter, and a cleaning of the throttle body.

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