If you're planning on going out to grab a bite for dinner in Phoenix, you should probably plan on bringing a couple of Jacksons for the pasta dish you're ordering. A report from Zagat on dining trends for the Phoenix metro area said the average person will spend $30.85 on a dinner out, among some other interesting facts.
If we continue using Zagat's numbers — which we will — the average tip left by diners in the Valley is 18.9 percent. This means servers will earn about $5.83 in tips for each person they take care of on a nightly basis.
But tipping can be a finicky thing.
Source: http://ktar.com/