When you're making the same drive over and over . . . commuting to work, picking up the kids, taking back streets home from the bathhouse so no one sees you . . . it's really easy to zone out and go on autopilot.

And a lot of people do.  A new study found that the average driver only stays alert for 11 minutes during a drive they're used to, like going to work.  After that, autopilot basically kicks in.

34% of people even say they sometimes get where they're going and can't remember most of the drive.

People also regularly go the wrong way when they're not paying attention . . . they miss a turn, or temporarily forget where they're going and head in the wrong direction.  And those mistakes cost you an average of $75 in gas every year.