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The Z06 was pretty much a no show, GM blamed CA 91 Octane fuel for it's supercharger failing - it came dead last as a result. So it was really the GT4 vs GT S - the GT4 suffered from understeer on their test laps. This is from memory as I threw the magazine in the trash a few days ago...
That's what I had suspected, with the exception of the "crap"tane issue. It's like how the Viper came in dead last a few years ago because it was falling apart during their road drive. Speaking of which, Road & Track at least included the ACR and 350R in their lineup. The RS was missing there, but the GT4 was included.