As I remember CAFE requirements for fuel milage are based on the entire product lines average fuel economy. So if they build and sell say 25 hummers, they are required to build and sell 100 sunfires to average out the fuel economy on the product line, as CAFE stands for "corporate average fuel economy" not based on A specific vehicle model. I could be wrong but that is how I remember it works.
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1987 Jeep YJ 403hp sbc 653hp on NOS
1998 Chev Z71
2007 Chev Trailblazer SS
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