I think this is a great move for GM and will help them sell more cars overall. It is even more beneficial for the Volt as it should help ease anxiety people might have over the "new technology" without costing GM much if anything in covered maintenance.
I have had my Volt for over 18 months and so far the only maintenance I have had done is rotation of the tires three times.
I have had my Volt for over 18 months and so far the only maintenance I have had done is rotation of the tires three times.