One more comment about Mister Softee.  Out of the hundreds of Mister Softee trucks, I have only seen one that offers fat-free frozen yogurt.  And it just so happens that on the weekends, this truck camps out on the Northeast corner of 67th street and Broadway in the heart of my five blocks. The owner is a sweetheart.  He offers the usual ice cream options but also has vanilla and chocolate frozen yogurt that is delicious and inexpensive (with the typical topping choices of sprinkles, cookie crunch, peanuts or hot fudge).   I saw this same truck once on a weekday near Penn Station, but I have never seen any others.  Please write if you know of another Mister Softee truck that carries frozen yogurt too.