[DGthe3]

Improving the fuel economy of the Z06 barely matters for CAFE. For 2014, GM will probably sell about 3 million cars & trucks in the US. The Z06 will probably be lucky to do 6000 units. That works out to 0.2% of their total fleet. There isn't really anything that you can do (besides killing the car off) that is going to cause any appreciable changes in GM's CAFE score.

I'm thinking they might be limiting it more because of durability. GM likes to brag about how many consecutive hours of wide open throttle their high performance engines can endure. Plus, didn't one of the articles say how durability was one of the reasons why they didn't go naturally aspirated (the AFM bits don't like spinning past 7 grand, apparently)