Peterbilt Model 579 tractor with EPIQ package (shown) has all available aerodynamic fairings and “closeouts” (gap covers), and other fuel-saving features to improve fuel efficiency by up to 14% over a base 579, Peterbilt says. An APEX package with an optimized drivetrain is optional for all heavy-duty models and can improve fuel efficiency by up to 4%. The 579 comes in two BBCs, with separate sleepers and with Paccar MX-13 or Cummins ISX12 or -15 diesels. The long-hood 587 has a wider cab and integrated sleeper, and MX-13 or ISX15 power. Other on-highway models are the narrow-cab 386, with MX or Cummins heavy diesels; 384, with Paccar PX-9 and MX-13, Cummins ISL9 and ISX12 diesels, and Cummins Westport I
Peterbilt Model 579 tractor with EPIQ package (shown) has all available aerodynamic fairings and “closeouts” (gap covers), and other fuel-saving features to improve fuel efficiency by up to 14% over a base 579, Peterbilt says. An APEX package with an optimized drivetrain is optional for all heavy-duty models and can improve fuel efficiency by up to 4%. The 579 comes in two BBCs, with separate sleepers and with Paccar MX-13 or Cummins ISX12 or -15 diesels. The long-hood 587 has a wider cab and integrated sleeper, and MX-13 or ISX15 power. Other on-highway models are the narrow-cab 386, with MX or Cummins heavy diesels; 384, with Paccar PX-9 and MX-13, Cummins ISL9 and ISX12 diesels, and Cummins Westport I
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