Haven't tested that yet. I will do so at New Years' and get back to you. I can definitely see why it'd be your preferred, but I'm not sure how well the mint would mesh with the root beer. That is, however, the alcoholic ingredient in the Top o' the Mornin' Smoothie. (vanilla ice cream, milk, Bailey's mint-chocolate. Further testing is ongoing to see if I can add more or keep it as simple as it is. I'm also working to test the Ruby Brick Road and improve the results of Autumn Fire-Apple (recipe name possibly changing).
At some point, I'll have to post my tea mixes as well; I actually managed to make one that tastes like coffee (but has less caffeine--which is good, since I can't drink coffee for medical reasons. :( )