One of my interests is Personality Type and Temperament. I also like Starbucks Frappucinos.
The Trenta is a 31-oz cold cup size introduced in January, 2011. Starbucks announced it by saying, "We're excited to offer this larger size to our iced coffee and Tazo® iced tea fans out there."
As I said, I like Frappucinos. I order a Venti (the 24 oz size). I want everything from the blender pitcher and I want some space between the drink and the lid, so the slush doesn't ooze through the straw hole and it's easier to stir. I ask for my Venti size drink in a Trenta cup.
There is no 31-oz Frappucino recipe. As of this date (Spring 2015), the only beverages that are sold in 31-oz (aka, Trenta) size are: Brewed Iced Coffee, Shaken Iced Tea, Iced Tea Lemonade, Refreshers, Fizzio Handcrafted Sodas. That shouldn't be a problem, because I'm not ordering a Trenta Frappucino; I'm ordering a Venti Frappucino (recipe) in a Trenta cup.
And that's where Temperament comes in.