Your Google-Fu needs some help.
0-60: 8.72 Seconds (EV Mode), 8.4 Seconds (hybrid mode)
http://www.thetruthaboutcars.com/2013/07/review-2013-chevrolet-volt-video/
Nathan and Roman say 9.20 (hybrid mode)
https://www.youtube.com/watch?v=DMSGnYGMBr8
0-60: 8.72 Seconds (EV Mode), 8.4 Seconds (hybrid mode)
http://www.thetruthaboutcars.com/2013/07/review-2013-chevrolet-volt-video/
Nathan and Roman say 9.20 (hybrid mode)
https://www.youtube.com/watch?v=DMSGnYGMBr8