The first Pepsi Challenge tour in 50 years didn’t feature regular or even Diet Pepsi. Instead, the blind taste-test showdown last year pitted Pepsi Zero Sugar against Coca-Cola Zero Sugar.

The first Pepsi Challenge tour in 50 years didn’t feature regular or even Diet Pepsi. Instead, the blind taste-test showdown ...

I’m a veteran of the Cola wars. I remember when “Diet” emerged as the new word attached to low-calorie sodas, and when the preferred label shifted to “Light,” as in Pepsi Light. Don’t get me started ...