Half tons (150/1500) and below only. The 250/2500 and up trucks are not included.
And really the CAFE standards are not the same as EPA standards. I can't remeber all the figures tossed around but sometinhg like the 26 or 28 MPG that trucks have to hit on the highway is like 22-24 MPG in an EPA setting so really the goal won't be that hard to reach other than it is based on the actual vehicles (and therefore the power train in them) sold not just the availability of a more efficient engine.
To complicate matters worse there is a huge bonus for flex-fuel vehicles so really I bet most automakers are actually really close to the CAFE standards now or exceeding them. Especially considering that nearly all GM trucks are flex-fuel and get some kind of break regardless of the fact that no one actually uses E85. I think eventually the automakers have to prove that flex-fuel is being used or that benefit goes away.
Sorry for the long response to a simple question.
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