I'm reliably* told that the ideal is to ask for half and half, normal and extra cold. Off the top of my head I can remember one occasion when I've actually been able to try this and I don't remember it being better than just a pint of normal Guiness.That’s interesting because my user name is due to the amount of Extra Cold I used to consume in the Welly in the Withdean days, when I was in my 20s.
Nowadays I can’t stand Extra Cold but love regular Guinness, porter and milk / chocolate stout.
Olives are my answer to the question btw.
*By a man who kept a bottle of HP sauce in his locker at work for his Friday sandwich "because Daddies is an inferior sauce". Clearly, a connoiseur of the finer things in life.