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I was merely asking for a quantitative comparison i.e. will £50 of 95 RON get me as many miles as £50 of V Power 99?
There are so many other variables when you start to look at additives etc. I didn’t buy a 6.2 litre engined car to worry about fuel economy, but I begrudge paying daft 15 pence/litre+ premiums for V Power every fill up. I live in the countryside, so the nearest Momentum is miles away. There is a Shell on the way to the motorway and the nicer roads of Teesdale so that’s what keeps it fed. I see the 98 RON sticker under the fuel flap every time I fill up and have read the manual, so am aware of what Mercedes designed for it.
Premium fuels (V-Power included) differ from standard fuels in two ways: higher Octane, and better additives pack.
With regards the former, I don't think you should compromise on the manufacturer's recommendations. So only buy fuel that has the minimum Octane rating required for your engine.
With regards the latter, buy Shell V-Power if you believe that their additives pack is indeed superior as they claim (and will better-clean and better-lubricate the injectors etc etc). But if you don't care much about fuel additives, then just buy the cheapest high-Octane fuel that meets the minimum requirement for your engine and that you can get locally, be it from Shell, Tesco, BP, Essex, Texaco, etc etc.
As for fuel economy... premium fuels will possibly be slightly more efficient, but any additional mpg will be insignificant and never cover the extra cost per litre, so I suggest that you do not take this into consideration at all when debating which fuel to buy.