my z06 w 550hp gets 25 mpg cruising in 6th at 85 mph of course at 130 mph on the track at redline she only gets 5 mpg LOL
My 2009 C6 with the NPP exhaust achieves 31 MPG Highway and 14 MPG City. For a 6.2L V8, this car is pretty magical when it comes to Miles Per Gallon [IMO]. The car is barely broken in, and it has 604 miles on it now. Sorry for the bad quality, the road was choppy as I was taking a picture. Image Unavailable, Please Login
I have a '05 C6 with the engine re-mapped and being an old engineer, I keep records on every tankful. On a level interstate at 80 mph I get between 30 and 32 mpg. Between 70 and 75, around 28 to 29. I can go from Reno to Orange County which is a little over 500 miles on a tank of gas. Not bad for a performance car.