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February 15, 2018

Photos: Peterbilt's Model 579 UltraLoft

Improved aerodynamics mean owners can get 1% better fuel economy than a Model 579 with a...

Improved aerodynamics mean owners can get 1% better fuel economy than a Model 579 with a discrete sleeper. Photo: Peterbilt

Improved aerodynamics mean owners can get 1% better fuel economy than a Model 579 with a discrete sleeper. Photo: Peterbilt
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