FUEL GRADE

[AlanD]

I dare not install that whilst in my work laptop connected to my work server but will try it when I get back tonight I think (if I remember).

[ben1.8T]

Use Tescos super unleaded thats 99 octane use to use it in my Golf use it on the quad now. 

[AlanD]

lol I also use Tesco 99 but just because its local.

[china]

So i can use 98 rom in a standard turbo engine,also will i notice any difference

[AlanD]

You will probs see a small increase in MPG, I doubt you will see much in terms of performance, maybe a little.

Placebo effect springs to mind. I cant really notice much difference in the MK5 although I use 99 RON all the time now as I'm lead to believe its better for my engine and the FSI engines are designed to run on higher octane RON. When I changed (stopped being a tight ass) my MPG went up ever so slightly, different people seem to experience different side effects.