1. It seems to completely discount surge pricing, which would likely change these numbers significantly.
2. It assumes that taxi and Uber behavior is very similar, but this seems pretty dubious for 2 major reasons:
a. In dense areas it's far more convenient to use a taxi than an Uber (you can hail one in a minute or two), while in less populated areas it's far more convenient to get an Uber. This would definitely skew Uber significantly towards longer, speedier trips.
b. Uber likely sees a greater proportion of utilization from airport rides. For an expensive trip like that, people are more price conscious and most New Yorkers know it's usually much cheaper to take Uber. When juxtaposed against the prospect of waiting in line for a ~$60 + tip taxi ride, the immediacy of a $63 Uber looks very appealing. Additionally, I imagine Uber is seeing disproportionate growth amongst tourists (who might already be using Uber elsewhere but are intimidated by hailing NYC taxis).