This month's Brian Lehrer Show series on cars and driving continues with car shares and rentals - and we take your calls on what you use. Our guest is Michelle Krebs, senior analyst at Edmunds.com and editor in chief of AutoObserver.com.

In the state that put the country on wheels, car ownership is as American as apple pie. But there are a growing number of people in Michigan who are giving up their vehicle titles and turning to Zipcar, one of the better known of a growing number of car-sharing services.