Originally Posted by Hoosiers
I understand that the industry in now slaved to MPG and emissions, but GM gets 26mpg out of the huge Vette V8. The next C7 5.5L DI is said to improve even further on that, pushing highway MPG into the 30's. So no, turbo is not the only solution.
That engine has a 6600 RPM redline. I think it is pretty safe to guess that a 6600 RPM N/A V8 from M Division would get lambasted just like the 7200 RPM turbo V8 has.