I too am 6'4" and am doubtful that you would be very comfortable. Try sitting in a Cruze as was suggested. Go by a Toyota dealership and sit in a Prius. It has an inch or two more clearance that the Volt. If you don't fit in it, you will not like the Volt. And the back seat is completely out of the question for you.6'8" may be cutting it REAL close. I am 6'4" and with the seat reclined to about 110-115 degrees, I have about an inch, inch and a half clearance for my head. I would really try to get a test drive before making a final decision.
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