Does supermarket fuel have 'lower capability' additives?

I have been advised that petrol additives are actually added during fuel station delivery. Non-branded stations, such as supermarkets, receive fewer or or lower capability additives which is partly why...

Would a fuel additive help prevent E10 problems with my Dacia Sandero?

Would adding a fuel additive or system cleaner help prevent any possible problems with using E10 petrol in my Dacia Sandero (2018 model)?

What will be the effect of more ethanol on fuel?

Currently, most petrol sold in the UK is E5 i.e 5% ethanol. I understand that the Government is considering increasing this to 10%. What would the effect of this be, especially on older cars, and in both...