Nearly two-thirds of Uber drivers use the ride-hailing service to collect additional income to supplement full- and part-time jobs. But in three large metropolitan cities, drivers make far less than the national average, about $20 per hour, after expenses. In Detroit, drivers make on average $8.77 per hour.

Uber is bumping up some drivers commission to 30%, its highest level ever, the company told FORBES Monday. In a new pilot program in San Francisco, a small percentage of new UberX drivers will pay a 30% commission on their first 20 rides in a week, 25% on their next 20 rides, and then 20% on any rides beyond that.

Your fare is automatically calculated and charged to the payment method you've linked to your Uber account. In some cities, Uber allows you to pay your fare in cash. This option must be selected before you request a ride. Immediately after a trip ends, your app will ask you to rate your driver from 1 to 5 Stars.