Rating Summary based on 16 reviews
Advantages Invaluable when used with a performance car
Disadvantages Pricier ... but that's why I use AA petrol watch!
Advantages Increased performance(esp mid range) and economy, quieter and smoother idling
Disadvantages Cost 89.9p per litre eye-wateringly expensive (at time of writing) availability-not too many Shell stations around these days,may need a couple of tankfulls to be effective, benefits only for those with performance cars/modded engines
Advantages Shell get much richer !!!!
Disadvantages I get much poorer !!!
Advantages Gives more power, smoother drive.
Disadvantages Price premium, availability.
Advantages Higher performance, cleans fuel system as you drive
Disadvantages None if you dont mind paying a little extra
Advantages Will make a marked improvement on your car.
Disadvantages Won't happen overnight. More expensive.
Advantages Cleaner full better for car
Disadvantages costs more
Advantages Fuel Economy, Overall Engine Performance
Disadvantages Estra Cost over standard unleaded
Advantages Increased MPG, better economy, improved performance
Disadvantages None that come to mind