Its like the Vette in the stats, recommended but not required...The compression on the v6 is higher(11.3 vs 10.7), but does not require premium...You will lose some top end power as the computer dials things back, but lots of Vette guys are running regular right now with no ill effects other than the loss of some top end...Sorry tried to copy the table from the press release, the spacing did not come over well....
http://wilsonniblett.wordpress.com/2...press-release/