The National Highway Traffic Safety Administration announced it is moving to reverse an Obama-era rule governing heavy-duty truck engine fuel efficiency, framing the action as removing restrictions on American engine innovation and manufacturing, on Aug. 28.
NHTSA said the original rule unfairly limited engineering options for heavy-duty truck manufacturers. Environmental groups and fuel economy advocates are expected to challenge the reversal in court and through the public comment process.
Heavy-duty trucks consume roughly one-quarter of all transportation fuel in the United States, making their efficiency standards a significant factor in national fuel consumption, greenhouse gas emissions and freight costs. Any change to these standards has ripple effects across the economy.
For communities located near freight corridors, truck stops and distribution centers, heavy-duty truck emissions are a direct air quality concern. Diesel exhaust is a major source of particulate matter and nitrogen oxides, which contribute to respiratory illness and premature death.
The trucking industry has been divided on fuel efficiency standards. Some manufacturers and fleet operators have argued that the Obama-era rule imposed compliance costs that made American trucks more expensive without proportional fuel savings. Others have invested heavily in efficient engine technology and prefer regulatory certainty.
The specific regulatory citation, affected model years and projected fleet fuel economy impact were not detailed in available release summaries. Those details will determine the actual magnitude of the policy change and its effects on fuel consumption and emissions.
Freight costs are ultimately borne by consumers through the prices of goods transported by truck, which includes the vast majority of consumer products. Changes in truck fuel efficiency affect the operating costs that trucking companies pass along to shippers and retailers.
The reversal is part of a broader administration effort to roll back vehicle efficiency and emissions regulations across the transportation sector.