Thought I'd try V power.

[Simon.Pieman]

Ok, what Shell say is cobblers, and I am to believe you over them, and my personal experience with this fuel. Well, I'd be willing to do that perhaps if you give us some background on your experience of developing and producing fuels for ICEs. It's good to have such experts on this forum 

I'll ignore the straw man arguement, of course I don't develop fuels. But, I used to race 24hr endurance in the eighties and our team were sponsored by Rock Oil who doctored our fuel with octane boosters -for a conventional engine that's really the only mod you can make to petrol to improve running (when you have increased the compression and/or squish) Believe me, if we could have added other chemicals to improve running we would known about them and had access to them.
Since you are trying to get me on a technical point regarding fuel and you believe what Shell tell you, how about telling me the technical information Shell have supplied to you about these 'advanced' fuels?
I don't mean marketing nonsense such as  'longer engine life, cleaner engine' blah blah. What chemicals are Shell adding to these fuels that are proven to improve running?