What does Super Unleaded do

The main difference between regular unleaded petrol and premium-branded unleaded is that the latter will have an increased octane rating, also known as research octane number (RON). ... Premium or super unleaded petrol also contain additives designed to keep your engine clean, so your car will perform better for longer.If your car calls for super unleaded (probably octane 91+) then do not put regular fuel in it, you can damage the motor. Especially if your motor has a turbo or supercharger, or if it's a newer car from 2000+ (especially a European car).Octane does not offer any better fuel mileage, increase engine horsepower, or make the engine start quicker. Higher octane only reduces the likelihood of engine knock or ping. ... Because higher octane gas burns slower, it is more resistant to knock when subjected to higher RPM and cylinder pressures.No matter what you've heard, premium-grade gasoline won't do more to clean deposits from your fuel injectors or other parts of the fuel system because today's regular gas contains the same detergent additives. ... Premium gas is not “stronger” gas.