What does PON mean?

Pump Octane Number (PON) refers to the octane rating displayed on gasoline pumps, indicating the fuel's ability to resist knocking.
PON is typically an average of the Research Octane Number (RON) and Motor Octane Number (MON) ratings.

Note:
Octane number is simply a measure of a fuel's tendency to resist knock.
A higher octane number indicates greater resistance to knocking under high-pressure conditions in the combustion chamber of an engine.
Knocking is an undesirable effect that can occur when the air/fuel mixture in an engine ignites spontaneously, before the spark plug fires. This can cause a loss of power, damage to engine components, and decreased fuel efficiency.

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