I don't know about the proposed new standards, but the current standards apply only to vehicles with a GVWR of greater than 8500 lbs. From the 2009 EPA mileage guide:
"Fuel economy regulations currently do not apply to vehicles with a Gross Vehicle Weight Rating (vehicle weight plus carrying capacity) of more than 8,500 pounds. Therefore, some large pickup trucks, vans, and SUVs are not tested, and fuel economy labels are not posted on their windows."
I would note that this standard is different than the definition that most manufacturers use to classify "light duty" versus "medium duty" trucks.
Also, in the past, the exemption of vehicles over 8500 GVWR has contributed to the popularity of monster SUVs. As long as gas is relatively cheap, people will buy what they want.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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