As we're sure you've noticed by now, General Motors has been making lots of waves over the past few days with the pricing announcement (finally!) of its 2011 Chevrolet Volt. And, as you're surely aware, GM's plug-in hybrid is capable of traveling at least 40 miles per charge without using a single drop of gasoline. But what happens when the time comes to pump some good ol' crude into the tank? You'll be using premium.