There are good reasons to tip a good driver beyond the stated cost of the service. Maybe they know the area well enough to get you through during rush hour. If

There are good reasons to tip a good driver beyond the stated cost of the service. Maybe they know the area well enough to get you through during rush hour. If you have a car seat you need to install and they can help quickly (as well as drive smoothly to keep the child from acting up) that is also a boon. If any service is exceptional, I am always happy to tip, even if I am already paying the full price (and living wage).