Back when I used to frequent rolling roads the mapper and dyno operators always said that BP 97 was/is the poorest of the 3 main so called ‘super unleaded’ fuels (bp/shell/tesco). It’s not that significant for someone using it in their regular car over e10 but for a mapped and or turbocharged car this fuel would be less resistant to detonation and potentially pull ignition timing and make less power over the exact same car on the other fuels.