Heads up, there are 2 SS' from 06-07, the 2.4 NA, and the 2.0 Supercharged.
With my old Supercharged, i got 38 hwy MPG (CDN), and then i got Stage II and a custom tune and got 43 hwy MPG (CDN). I averaged 28 combined mpg (CDN). That car was pretty good on fuel, just the tank was a pinch too small to get any range out of it.