... and milestones (DOE, 2000a). This structure was followed for the three groups of truck classifications: Classes 1 and 2trucks (pickups, vans, SUVs), Classes 3 to 6 trucks (medium-duty trucks, such as ... 2000a.02468101214197019801990200020102020ActualuseClass 3–8 trucks Class 1–2 trucks(pickups, vans,SUVs)AutomobilesProjecteduse Energy Use (millions of barrels per day)Yearsupplant the current Tier 1 emission standards. Tier ... government/industrypartnerships. First, DOE and OHVT s missions, as well asgoverning statutes, laws, and directives from Congress, mustbe satisfied. Second, the intersection of the federal mission and the customer s interests...