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The Peterbilt Model 384 has been recognized as fuel efficient and environmentally friendly by the Environmental Protection Agency’s (EPA) SmartWay program. The Model 384 joins Peterbilt Models 387 and 386 as EPA SmartWay compliant offering customers fuel savings of between 10 and 20 percent, lower greenhouse gas emissions, and significantly reduced NOx, particulate matter and other air pollutants. The Peterbilt Model 384 is equipped with Peterbilt’s new proprietary Aero Package combining a roof fairing and trim tabs, a sleeper roof transition, enhanced chassis fairings, an aero battery/tool box, a composite sunvisor, a 3-inch sleeper extender and aerodynamic mirrors to provide an estimated 12 percent improvement in fuel efficiency gains over a non-equipped model.