Test Drive: Driving Peterbilt’s Model 579 Epiq UltraLoft [Video]

On a trip from Phoenix, Arizona, to Denton, Texas, Equipment Editor Jim Park was impressed by the fully-equipped Peterbilt Model 579’s efficiency and refinement. At one point he was pushing 11 mpg despite the fact that his max cruise control speed of 65 mph prevented him from getting the most out of downhill coasting.