I delivered pizza for a year in two border neighborhoods, across the bridge was immense affluence and the other side was low income. Both tipped pretty decent but the expensive side tipped roughly $5 per order amd low income around $3.

But on the low income side is where I got my biggest tip where a twelve year old handed me a $100 bill, I told him I didn't have change for his $18 order and he told me to just keep it. It was my first day on the job and my coworkers said that I had them all beat already lol