Regular unleaded is a type of gasoline commonly used in vehicles. It typically has an octane rating of 87, which helps prevent engine knocking and ensures smooth performance. This fuel is suitable for most cars and is often the least expensive option at the pump. Regular unleaded is different from premium gasoline, which has a higher octane rating, usually around 91 or 93. While some high-performance vehicles require premium fuel for optimal operation, most standard vehicles run efficiently on regular unleaded. It is widely available at gas stations across the country, making it a convenient choice for everyday drivers.