Starbucks' current
largest size for iced drinks is a 24-ounce "Venti" cup. It also uses 20-ounce "Venti" cups for hot coffee and other beverages.
Lisa Baertlein points out that the limited market test comes as some McDonald's outlets around the country are offering a 32-ounce sweet tea for $1 in a bid to attract super-sized drink mavens.