Starbucks Super-Sizes With New Trenta Cup Company pours it on in war with McDonald's By Mary Papenfuss, Newser User Posted Jan 17, 2011 4:23 AM CST 6 comments Comments Make room for an even bigger cup, the 31-ounce Trenta. (AP Photo/Starbucks) (Newser) – Make room for a big shot of Starbucks. The caffeine-pushing franchise is unveiling a new 31-ounce "Trenta" cup size, which holds 7 ounces more than its current largest Venti cup. The new size will be only for iced drinks, including iced teas, coffees, and lemonade teas. The drinks, selling for 50 cents more than the Venti size, will be introduced in 14 states beginning this month, and will be in all US Starbucks by May, Reuters reports. The move is the latest strategy in the war between Starbucks and McDonald's, which is making inroads into Starbucks' market, and offers a 32-ounce sweet tea drink.