I was reading the other day about the importance of the head when pouring beer, and I wondered if there are any similar considerations when pouring cola's? I'm a huge fan of good Coke (my favorite is Brazilian Coke, but I'll take anything with cane sugar), and I'm just wondering if I can improve an already great tasting drink!
More head = less carbonation, which will change the mouthfeel of the drink, albeit largely imperceptibly for most people (myself included). Less carbonation will also change the actual perception of flavour; it will taste sweeter, mostly.
I find it bizarre that--apart from the cane sugar, which does impart a different flavour than HFCS--you think there is a difference between Coke made in various places. They all work to the exact same recipe. Transnational brands work because the Coke--again, minus the HFCS/cane sugar difference--tastes the same in Duluth as it does in Yellowknife as it does in Sao Paulo as it does in Beijing. Thet's kind of the whole point of a specific product of that nature.
As an FYI, multiple studies have shown that almost nobody can actually taste the difference between Coke and Pepsi. They may think they can, but MRI has shown that they really can't, although there was an intriguing finding that when test subjects were told they were drinking Coke (while actually drinking Pepsi) the same brain centres lit up as when actually drinking Coke. The reverse was not true for Pepsi. Odd, that.