This week’s guest is Mike Roeth, Executive Director of the North American Council for Freight Efficiency or NACFE.  NACFE has been around for over 15 years - originating from a workshop run by the Rocky Mountain Institute in 2009.  Their objective is to drive the development and adoption of efficiency enhancing, environmentally beneficial, and cost-effective technologies, services, and operational practices in the movement of goods across North America.  Mike has been leading NACFE in these efforts pretty much since its inception.  In the conversation, Mike discusses the concept of the “Messy MIddle” - a term that NACFE introduced to the industry.  The Messy Middle is the period between the trucking industry transitioning from a well established and known technology (that would be diesel internal combustion engines) to a future technology (zero emission battery electric vehicles).  Major technology transitions are never simple or clean, and NACFE recognizes this and analyzes how different powertrain technologies (to include Renewable diesel, Biodiesel, Natural Gas, Green Hydrogen, and battery electric) can be employed to bridge this middle ground.   In the podcast, Mike discusses how different trucking operations (payload, duty cycle, required range) are better suited to different powertrain technologies, highlights the challenges and hurdles to the adoption of these powertrain technologies, and outlines the roles that the various stakeholders play.