To start, you'll need to register and then use the app to reserve a vehicle of your choice. At first, Maven will only have 60 vehicles available at more than 24 locations in the city, but there's always a chance it'll roll out more if the service gets popular enough. Those locations include downtown Los Angeles, Little Tokyo, South Park and areas near the University of Southern California.

You can rent cars for $8 an hour -- that cost includes both fuel and insurance. As you might expect from a GM service, all of the available cars are part of the GM family. They include the Chevrolet Cruze, Malibu, Tahoe and Volt, the GMC Acadia and Yukon, plus Cadillacs like the ATS, CTS, CT6, XT5 and Escalade. And, of course, they'll all come with the OnStar service built right in.