Any car that the factory designed to be flat towed can coast in N engine off without fear of damaging the tranny. Cobalts are and I think the models before it were as well, back to the Saturn SL's. Electric Power steering the in Cobalt address the other issue.
The 2010 turned it's self off driving down the highway with cruise set at 55 a few days ago, just slipped it into N hit the key and it's running again.
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