This is going to be buried, because I'm way late to the party here...but interestingly, Uber automatically sets your tip level at 20% for Uber TAXI in your sett

This is going to be buried, because I'm way late to the party here...but interestingly, Uber automatically sets your tip level at 20% for Uber TAXI in your settings, which you can change down to 0% and up to 30%.