If someone is making $20/hr net income driving at night (pretty average for big cities according to this: https://drive.google.com/file/d/0B1s08BdVqCgrZWZkV0ZfZnhGUGc...), do you really think the wear costs are more than a few bucks per hour?
So assuming 150 miles per 8 hours, the average uber driver is paying about $11/hr in fuel and depreciation costs.
So the net income after that would probably be more like $9/hr.
1: http://newsroom.aaa.com/tag/driving-cost-per-mile/
2: https://www.quora.com/How-many-miles-does-a-full-time-driver...
Curious what the huge discrepancy is there (between self-reported and gathered data), though without being able to see the underlying data I guess we can't tell.