Most pizza drivers make food server minimum wage ... $2.13/hr. They work for tips and do it in their own car. They saved you the trip ... use this guide:
The common courtesy is 15% for normal service
If 15% is less than $2, please follow the $2 minimum. Remember, it should be a $2 minimum to have someone come to your house.
20% or more if the service is excellent.
10% or less for poor service. Nothing for very bad service.
If the order is $50 or more, at least 10%.
It's considerate to tip slightly more during bad weather
In rain, snow, extreme cold, or extreme heat, at least $1 more. It's thoughtful. The service is greater.
It's also considerate to tip slightly more for long distance
If your location is more than three miles from the store, it's considerate to tip $1 more.
If more than five miles, increase by another $1.
Remember that a five-mile drive in a residential area can take 30 minutes for the ten-mile round-trip.
Learn more
here.