Ive read loads of posts with people arguing whether optimax or super is more responsive and makes your car quicker than standard 95 RON. Is it all in the mind? I know if I spend 9p a litre more on fuel then I want something for my money. I reckon the best way to sort the arguement is: Run your car until it is just about empty of fuel. Get your girlfriend/friend/brother etc to take your car to the petrol station and fill it up with either Optimax/Super or just standard 95ron, but make sure they dont tell you what they put in. Then take your car out and if Super/Optimax work as well as everyone claims, the difference should be immediately noticable and you will know exactly what was put in the car! If you get it wrong, then weve all been had..