Volt owners will be able to brag about their mileage more easily now thanks to OnStar. "GM rushed work on a new API to get a popular Volt owner site back on road. You probably don't think of your car as a developer platform, but Mike Rosack did. A few days after buying his Chevy Volt, Rosack started slowly mining his driving data. But he eventually revved up his efforts and created a community platform for drivers to track their own efficiency. Today more than 1,800 Volt owners compare stats with each other, jockeying for position on Rosack's Volt Stats leader board."