What is unleaded fuel?

Unleaded fuel is a type of gasoline that does not contain the additive tetraethyl lead. This type of fuel is commonly used in vehicles that have catalytic converters, as leaded fuel can damage the converter. Unleaded fuel is also better for the environment, as it produces fewer harmful emissions than leaded fuel. In many countries, unleaded fuel is the standard type of gasoline available at gas stations. It is typically labeled as "regular unleaded" or "premium unleaded" based on its octane rating. Premium unleaded fuel has a higher octane rating, which can improve engine performance in certain vehicles.