Because the mass public really doesnt care that the z28 will do 0-60 in 5.2 vs the mustang doing it in 5.8. They care about looks, saftey, interior design, quality (build and interior) and reliability. Unfortunately for GM, the Cam and Fire are neither of these. Almost everyone i have known that owned a camaro has absolutely hated them by the end of ownership. Personally i've owned 4 mustangs (2 v6's, 1 GT, and 1 Boss 96' supercharged). I always found the mustang to be a better built car with signifigantly better appearance. Those things, along with price, makes the mustang a no brainer for Joe Blow.