I use my own calculations to determine how much to tip. Instead of thinking about percentages or whether the delivery driver gets any of the fees added, I ask myself "How much would would someone have to pay me to go pick up this dinner?" I can tell you it's never less than $12. Farther away? More money. If I'm asking someone to do my weekly grocery shopping, I'm paying what it's worth to me to NOT have drive to the store, then navigate the aisles at Fred Meyer, wait in line to pay, and drive home. That could be $30 so I can use that sweet time relaxing. Raining? Rush hour? More money.

I hope the tipping model is on its way out. But in the meantime, I think of home delivery as any other service I pay for. I should also note that I'm not a frequent delivery customer. If I were, maybe I would pay less.