The 2014 Chevrolet SS isn't vying for family sedan duty (that's the Malibu or Impala), and despite its huge 6.2-liter V-8 it omits fuel-saving technology like GM's Active Fuel Management, or engine stop-start. It's blissfully, it seems, a guzzler.
The bright side, as we've noticed from a number of other vehicles with very large-displacement engines, is that you likely won't see much lower than the EPA ratings--even when you drive the SS hard. On the other hand, it would require quite the magical tailwind to approach 30 mpg.
In a first drive opportunity, our car was averaging more than 16 mpg on a 65-mile, mostly uphill loop, then barely 20 on a 75-mile, mostly downhill loop that included some more reserved expressway-and-boulevard driving.