Speaking at the annual geek confab known as South by Southwest, Google VP Marissa Mayer announced that Google Maps is being used by over 150 million mobile map users, about 40% of the apps' usage. In addition, mobile users looking to get around used Google Maps as their Google Maps app to navigate over 12 billion miles in the last year. Mayer went on to say that thanks to Google's new traffic routing feature, users are saving about 2 years worth of time every day rerouting their driving to get by bad traffic. Many of the features of Google Maps for Android aren't yet available for the iPhone, but Mayer says that while that will eventually change, Google goes to the Android platform first because Android obviously has a larger audience (course, the fact that Google powers the Android OS has nothing to do with it, right?).