I hear what your saying and like I said i'd been putting in the Castrol stuff beforehand
but do you really think it makes that much difference, or has it been proven?
Same for V-power over the normal stuff, ran it on V-power for most of the first year, couldnt get it one day when i turned up so put the normal stuff in and I can't tell the difference, possibly only the consumption if i'm being honest, but that doesnt really matter when it's about 8p more a litre than the normal unleaded, so your not making any savings there
I know it's my choice what i put in it, but i'm struggling to see advantages with the 'so-called' better stuff