Medium- and Heavy-Duty Truck Fuel Economy

The National Academy of Sciences (NAS) has released the Phase Two Final Report discussing fuel consumption and GHG emissions for medium- and heavy-duty vehicles (downloadable here). The report focuses on a possible third phase of regulations that could be promulgated for the post-2027 timeframe.   Delivered to its sponsor (the US DOT) last October, the report relies on work conducted between 2014 and the end of 2017.  The report was originally to have been delivered by March 2018, however, a prolonged lapse of funding from the US DOT resulted in an extended delay.