Usage costs for cars are usually tagged at around $0.50-$0.60 per mile [1]. Looking around, seems like the average 8 hour uber driver is putting on about 100-200 miles per shift [2].
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.
The analysis I linked above calculated the net earnings after all expenses as being ~$13/hr on average (and included all registration and insurance costs as well as the AAA figure in expenses). That would mean higher hourly earnings for part-time drivers in big cities (who often only work Friday/Saturday nights).
Hm interesting, the report suggests that 8-hour drivers are doing more like 60 miles per shift (($4.79 * 8) / 0.6).
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.