Burger King has a $1, 16 0z special (at least, near me) Frozen Coca-Cola that has absolutely nailed that old-time flavor. Sweet and syrupy. Tastes like The REAL THING.
I don't know what made me try it. I am not a soft drink user, at all. Haven't had a 'soda' without alcohol in decades. Seriously, It was an outstanding surprise.