This is so annoying, my Volvo V40 with a 1.5 litre engine...152PS, uses the same amount of petrol as you guys are getting, and you have about 300PS to play with...and my personal opinion, putting 95 RON supermarket fuel is like drinking supermarket branded beer and not the usual (budwiser, Carlsberg, Guiness etc)...besides with Momentum 99 around the same price as Shell/Esso regular 95 Ron, I thought it would be no brainer which fuel to go for? The RAC however does say thought that V power is the only true 99 RON fuel, where as Momentum 99 is not due to how their 99 RON is achieved.
https://www.raccars.co.uk/news/are-you-a-fuel-snob
https://www.raccars.co.uk/news/are-you-a-fuel-snob