HYBRID - Model 335 A Model of Efficiency & Style Peterbilt’s medium duty Model 335 Hybrid Electric (HE) features distinctive styling, enhanced performance and serviceability, and the efficiency of the hybrid system. Available in a Class 7 configuration, the versatile Model 335 is a strong performer in a wide array of applications including inter- and inner-city pickup and delivery, fire and rescue, beverage, municipal and refuse. The Model 335 HE utilizes components that provide up to a 80% reduction in engine idling and a 30 to 40% improvement in fuel efficiency. Configured for a utility application, further savings are realized through on-road and electric operation of the Power Take-Off (PTO) using the on-board lithium-ion batteries, which allow the body to operate with the engine off. Once this power is depleted an automatic engine start and shut down sequence occurs to recharge the batteries. The Model 335 HE brings distinctive styling, superior functionality and exceptional value to rugged jobsites and congested cityscapes across North America.