... 1999.05001,0001,5002,0002,5001980198219841986198819901992199419961998Year0150300450600750Class 8 trucksClass 7 trucksClass 8 Trucks (in thousands)Class 7 Trucks (in thousands)FIGURE 1-2 Number of Class 7 and 8 trucks in use, 1982–1997. Source: Eberhardt, 2000a.02468101214197019801990200020102020ActualuseClass ... 2000a.02468101214197019801990200020102020ActualuseClass 3–8 trucks Class 1–2 trucks(pickups, vans,SUVs)AutomobilesProjecteduseEnergy Use (millions of barrels per day)Yearsupplant the current Tier 1 emission standards. Tier ... overcoming the barriers, and determining schedules and milestones (DOE, 2000a). This structure was followed for the three groups of truck classifications: Classes 1 and 2trucks (pickups, vans, SUVs),...