#Dtna

EPA Extends DEF Derate Grace Period to 650 Miles, 25 mph Floor

New EPA guidance gives fleets 650 miles of warning-only operation after a DEF fault, then 4,200 miles at 15% derate before speed drops to 25 mph. Software…

Freightliner Cascadia Fuel Economy Up 35% Since 2007 on Aero, Powertrain Tweaks

DTNA engineers detail the incremental changes, bumper air ducts, combustion timing, and aerodynamic refinements, that delivered the efficiency gains in the…