Since you’re parsing it out, keep in mind that a Pizza Hut delivery driver in Missouri makes $16.64/hr while one in Los Angeles makes $18.64/hr. But I live in West Los Angeles and tip about 18% because it’s a bitch to get through traffic to my street, especially at dinnertime, and there’s no parking. I tip the same percent for weekly groceries from Yummy.com even though the total is much higher so the tip is about $50 because they’re picking out the items, bagging, driving several miles and lugging several bags to my door. If I had to do it all myself I’d damn well tip myself that much!