General Motors Company [NYSE:GM] didn't formally announce this, but Corvette Blogger spotted the Z06 gas mileage figures on the EPA's website. The EPA rates the car at 13/23 mpg city/highway and 16 mpg combined. Figures are only listed for the eight-speed automatic, though.
This would appear to put the Z06 on the list of cars requiring the U.S. "gas guzzler" but, again, GM hasn't confirmed anything.
That's pretty dismal, even compared to the non-Z06 2015 Corvette Stingray, which gets 17/29 mpg city/highway and 21 mpg combined with the seven-speed manual transmission, or 16/29 mpg city/highway and 20 mpg combined with the eight-speed automatic.
The 2015 Dodge Challenger SRT Hellcat is EPA-rated at 13/22 mpg city/highway and 16 mpg combined with its own eight-speed automatic, while the Viper gets a very un-economical 12/21 mpg city/highway and 15 mpg combined.