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A comment on Uber Driver Tip-Hustling Schemes. Parent comment
Edit: here are some supporting links.
15-20% suggested with 20%+ recognized as a minority opinion and for extra good service: http://www.cnn.com/2015/03/02/travel/experts-guide-to-tippin...
The highest tipping state averages 17% and the lowest averages 15%: https://qz.com/189458/the-united-states-of-tipping/
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Edit: here are some supporting links.
15-20% suggested with 20%+ recognized as a minority opinion and for extra good service: http://www.cnn.com/2015/03/02/travel/experts-guide-to-tippin...
The highest tipping state averages 17% and the lowest averages 15%: https://qz.com/189458/the-united-states-of-tipping/