GM's OnStar team would really like us to stay on the electric side of the Chevy Volt's powertrain as much as possible. That's the selling point, after all. Rather than simply preach green driving and hope for the best, the division is testing a new EcoHub app that reminds Volt drivers just how miserly their plug-in hybrids can be. Qualifying owners who opt in or subscribe to OnStar have the Volt's energy usage co
