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Mack Trucks now offers special components for Pinnacle Axle Back Sleepers as part of the U.S. Environmental Protection Agency’s SmartWay Transport Partnership. Proven to reduce fuel consumption and lower emissions of greenhouse gases, Pinnacle tractors built with the following components meet the EPA”s environmental standards for excellence and can be designated as certified SmartWay tractors. Full Roof Fairings & Side Shields improve fuel economy up to 15 percent by moving air efficiently between the back of the cab and the front of the trailer. Cab Side Extenders, 4″ in length, reduce drag while the truck is moving. Aerodynamic Front Bumper allows air to move smoothly around and under the front of the truck.