Correct answer
It can reduce performance and increase fuel consumption.
It restricts airflow and can reduce performance and increase fuel consumption. Do not generalise this effect to every fuel system: engines with injection and electronic mixture control can have a different effect on fuel consumption. Inspect and replace or service the filter as the manufacturer specifies; do not ride without the filter element, which protects the engine from airborne impurities.
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It always reduces fuel consumption without affecting performance.
It can reduce performance and increase fuel consumption.
It cannot affect airflow or performance.
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