Hi Chris,
I've attached a scan of Wenger's logbook entry for 17 November 1942, showing that he flew '13' on this date. He did fly other FW 190s in the period from 28 August to 17 November 1942, but as you say, '13' seems to have been his favourite.
Cheers,
Andrew A.
Air War Publications -
www.airwarpublications.com