EPA Proposes 100% Reallocation of Refinery Biofuel Exemptions
The agency wants to shift compliance costs back to refiners that received small-refinery waivers, restoring demand for biodiesel and renewable diesel that hits…
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EPA 2027 NOx Rule Stands, But Non-Conformance Penalty Loophole Still Unfinished
Daimler Truck commits to 35mg NOx compliance while competitors wait for EPA to finalize pay-per-engine penalty option. January 1 deadline unchanged.
NHTSA Drops Engine-Level Fuel Standards, Shifts to Whole-Vehicle Targets
Trump administration says manufacturers can choose how to meet efficiency rules. No estimate yet on what it saves per truck.
DEF Act Moves Fast in Congress, But Limp-Mode Fix Isn't New
H.R. 9618 cleared subcommittee five days after introduction. The bill protects EPA guidance already on the books that lets truck makers raise limp-mode speed…
EPA Proposes Killing Diesel Derate on New Engines, Hearing July 29
EPA signed a proposed rule July 9 to stop new diesel engines from derating to 5 mph when emissions sensors fault. Virtual hearing runs July 29 and 30; written…
EPA Lets Truck Makers Raise DEF Limp-Mode Speed to 25 MPH
PACCAR and Daimler are rolling out software updates that extend DEF fault timelines to 160 hours and raise final derate speed from 5 mph to 25 mph, following…
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…
Engine Technology Forum Launches SCR, DEF Resource Center
New website consolidates technical fact sheets, webinars, and policy guidance on selective catalytic reduction and diesel exhaust fluid systems for fleets…
Driver Retention Crisis Collides With 2027 EPA Prebuy, ACT Research
Fleets face vanishing truck build slots and tightening driver markets as 2027 EPA rule triggers prebuy surge, ACT Research president Ken Vieth warns.