They almost perfectly match the TCO numbers from AAA. They show an average of $8,849/year at 15,000 miles/year, which is 59 cents/mile. The cheapest vehicle type they list is small sedans, which are $6,777/year or 45 cents/mile. https://newsroom.aaa.com/auto/your-driving-costs/

It seems large because we aren’t used to looking at TCO per mile, and only think about the cost of fuel.

I meant 59 cents/mile is generous for estimating your Uber driving costs.

The AAA average includes pickup trucks, which hopefully you wouldn't be using for Uber.

Edmunds puts the TCO for 5 years (includes insurance and gas) for a Prius @15,000 miles/year at $30,600. That is 40.8 cents/mile. 59c is 45% higher.

(This assumes you start with a brand new Prius; you may optimize better as an Uber driver)