The tips are analyzed as a percentage of the overall order, and cash tips can’t be tracked. At the end of ordering process, GrubHub customers can select to add a 10%, 15% or 20% tip or add their own amount.
For the entire 2013-2014 winter, the highest tipping cities were: Denver at 15.7% of the total delivery price, Dallas at 15.1% and Charlottesville, Virginia, at 15%.
