I'm just venturing a guess from memory here, because it's been a while since I've had either Uno's downtown or in the suburbs (both, IMO, are really bad), but it looked like the suburbs were using crushed whole tomatoes while downtown it looked for all the world like canned diced tomatoes (the pieces were all too even). I remember sitting in the downtown Uno's thinking, "What's the big deal about this place--look at these crappy ingredients" (there was something canned about the green pepper, too). I remember no evidence of 6-in-1. I pretty much duplicated their sauce at home with hand-crushed whole tomatoes, garlic, salt, pepper, and spices. I always add sugar--don't know if they do.
Since Uno's is a chain and looking for the most profit potential, they probably do use garlic powder. Undoubtedly no San Marzanos. Evelyn Slomon "The Pizza Book"), who claims to have interviewed the owners of the big chains (but whose recipes do not match what you get in the restaurant), says it's: 1 28-oz. can whole tomatoes, well-drained and coarsely chopped; 2 garlic cloves minced; 3 tsp. dried oregano; and 4 TBS grated Parmesan.
Hope this helps--maybe someone will have more inside knowledge!
