What's the most expensive Bourbon you've ever mixed with cola?
In my case, it was Hirsch 20. After going through (and loving every drop) four bottles of the blue wax 16 year old, the 20 (that I'd saved for over 10 years) was a disappointment. I drank about a third of it neat, about a third in vatting experiments, and a third, yes, with Coke.
I paid $60 for the Hirsch 20, in 1996 dollars.