Yeh thanks lads, the point im trying to get to is the fuel can be a little different, its coming out of a huge tank, most of the cars are modern so the petrol is only a few months old, but now and again the cars could have stood for ages. The fuel always looks mega clean, but obviously you cant tell by eye. , I am currently running it on a tankfull, with a shot of octane booster my dad had and its running fine, cant hear pinking, it boosts well, cant feel any difference? Is there no way off boosting the octane level of the fuel safely? Thanks:)