Crafted jointly by the Environmental Protection Agency (EPA) and the National Highway Traffic Safety Administration (NHTSA), the new GHG/fuel economy proposals are “tiered” to cover three distinct vehicle categories, according to those agencies: heavy trucks and tractor-trailers, heavy-duty pickups and vans, and vocational vehicles.
http://fleetowner.com/fuel_economy/archive/truck-fuel-economy-rules-1025/
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