Do you get Better gas mileage using unleaded or super unleaded?

Typically, using regular unleaded gasoline is sufficient for most vehicles and can provide better gas mileage compared to super unleaded, which is higher in octane. Higher octane fuels are designed for high-performance engines that require them to prevent knocking, but using them in engines that don't need it generally doesn't improve efficiency. In fact, using super unleaded in an engine designed for regular may not yield any noticeable benefits. Always refer to your vehicle's owner manual for the recommended fuel type for optimal performance and efficiency.