I drove a rental V6 Camaro a year ago and even took it to Orlando Speedworld. It went 14.44@97. No RS badge, nothing. I was pretty impressed for being a base model. That being said, it was a horrible car to drive, cant see shit in it.
As it was already said, the V6 Mustang would do better in power and MPG. It already has a large aftermarket for it. I could see 6 years from now when a V6 was a bit cheaper and then mod it, but for what they cost new, just spend the money and get a V8.