John its still not clear to me what your mk5 running like a dream or your mates audi vvt have to do with the mk7 or octane, I'll be interested if you can explain the relevance.
I will gladly post some proof that some cars see improvement when I get home. The question is is the mk7 one of them.
The point I was making was that the post said after a car was remapped it needed to be run on 98, but it does not as it made no difference to the gti I had remapped at 2000 miles to the power or fuel consumption or long term reliability. They keep going on about the 98 cleaning your engine but having used cheaper fuel for so long there is no prove it does. You are asking about vvt and I am telling you that in the Audi engine my friend has been trying tesco 99 and has seen no difference. So why would the gti be any better?