there is this guy i work with at a vw dealership and he is a complete freak for anything vw so he knows these cars inside and out and everything to do with them, he reckons your car's computer will learn what fuel your using and adapt to it for better economy so the better more clean fuel you run the better milage youll get.

and volkswagen recommends castrol oil which (apparently. i could be gettin all this wrong but the end point is right atleast) is part of the BP group or whatever, so in the end he recommends using BP Ultimate 98, but 95 is pretty much as good i suppose. whatever you can justify buying. i use 95. i cant be stuffed spending the extra 10 cents for an extra 2 octane because i dont notice the difference in milage or performance.

point: buy BP Ultimate or as high BP fuel as you can.
the end.