Studies show an inflatable, rigid “boat tail” improves heavy-truck fuel economy. For more than 35 years, Wayne Simons, engineering manager for Kenworth Trucking Co.’s advanced concepts team, has experimented and developed methods to increase the aerodynamic efficiency of the road’s largest vehicles: tractor-trailer trucks. Simons led the team that developed Kenworth’s T600A in 1985, still regarded as one of the most aerodynamic heavy-duty trucks ever put into series production. ...

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