Looser Fuel Economy Rules Could Rev Up America’s Auto Freight Industry

CAFE Standards Reset: Can Looser Fuel Economy Rules Restart Auto Freight?

The U.S. Department of Transportation’s reset of Corporate Average Fuel Economy standards gives automakers more flexibility to build trucks, SUVs and internal-combustion vehicles. For freight carriers, however, the change is unlikely to create a significant new source of truckload demand in the near term.

USDOT finalized its “Freedom Means Affordable Cars” rule on Sept. 28, resetting fuel economy requirements through model year 2031. The new path reaches a fleet average of about 34.5 mpg by 2031, compared with roughly 50.4 mpg under the previous standards.

The department says the rule could reduce the average new-vehicle price by $1,300 and save consumers $138 billion over five years. It also removes the need for automakers to assume electric vehicle production or credit trading when planning compliance.

That flexibility is particularly important to Detroit’s automakers, whose U.S. lineups are weighted toward pickups and SUVs. But any resulting increase in production is expected to develop slowly, as vehicle programs typically take two to four years to change. The most likely effects would appear in model years 2027 through 2029 rather than in the current freight cycle.

Freight remains constrained by capacity

SONAR data shows that the 2026 truckload market is still being driven primarily by capacity, not a surge in freight demand. Tender volume has increased, but tender rejections have risen much faster. Once rejected loads are removed from the volume estimate, the amount of freight actually accepted for movement is roughly flat to down from a year earlier.

Nationally, the SONAR Tender Volume Index averaged 11,338 in the third quarter, up 8.5% from 10,447 a year earlier. The Tender Rejection Index, however, rose to 14.5% from 5.3%. That left implied accepted volume down 2%, at 9,693 compared with 9,892 in the 2025 quarter.

Detroit’s auto market was tighter than the national average. The Detroit tender volume index increased 13.1%, to 233.1 from 206.1. Yet implied accepted volume declined 1.9%, to 192.0 from 195.8. Tender rejections averaged 17.6% in the third quarter, compared with 5% a year earlier.

For drivers and carriers, the distinction matters. Higher rejection rates do not necessarily mean shippers are offering substantially more freight. In the current market, the data indicates that carriers are rejecting more tenders because fewer trucks are available to cover them.

Any auto-related freight increase would be limited

The CAFE reset could support domestic production, especially for truck and SUV programs operated by the Detroit Three. Those manufacturers also rely on extensive supplier networks across Michigan, Ohio, Indiana, Kentucky, Tennessee and South Carolina.

Still, the expected freight effect is small. The estimated increase in light-vehicle output is between 0.5% and 2% by 2027 or 2028. That would add well under 0.1% to national truckload volume, with the impact concentrated in Midwest and Southeast auto markets.

A scenario analysis places the base-case increase at about 167,000 vehicles annually, or approximately 1% of projected incremental vehicle sales. That would translate to about 0.05% more national truckload volume and roughly 0.3% in core auto markets such as Detroit, Toledo and Indianapolis.

The upper-end estimate is about 0.1% nationally and 0.5% in core auto markets. Even that increase would be small compared with the year-over-year rise in national tender rejections.

Auto-related freight also does not move exclusively by dry van. Finished vehicles rely heavily on rail and specialized car-haul fleets, while parts and plant-related freight can move by van, flatbed and other equipment. A change in CAFE-driven production would therefore be concentrated in specific lanes and equipment types rather than spread evenly across the truckload network.

Rules influence production, but markets determine results

The new standards change the incentives facing automakers, but they do not guarantee higher sales or production. The civil penalty for CAFE violations was already set to zero in July 2025, reducing the immediate financial pressure to meet the previous targets.

Other factors continue to weigh more directly on vehicle demand. Average transaction prices reached $50,089 in August, while average monthly payments reached $821 in September. Consumer sentiment fell to 48.1 in September, with fuel prices, interest rates and tariffs among the concerns affecting buying conditions.

Looser standards may allow automakers to emphasize the trucks and SUVs that generate the strongest profits. At the same time, higher gasoline and diesel prices can push consumers toward hybrids and more efficient vehicles. The regulatory incentive and the consumer response do not necessarily point in the same direction.

Longstanding policies also continue to shape the market. Footprint-based CAFE standards generally give larger light-duty vehicles lower fuel economy targets. The 25% tariff on imported light trucks, commonly known as the Chicken Tax, encourages manufacturers to build pickups and similar vehicles in North America.

Together, those policies help keep truck production and parts demand concentrated in domestic manufacturing regions. They may protect existing freight flows, but they are less likely to create a large new volume of freight on their own.

What carriers should watch

The clearest sign of a genuine auto-freight recovery would be rising tender volume accompanied by stable or declining rejection rates. Rising rejections alone would indicate tighter capacity rather than stronger demand.

Production schedule changes at Detroit Three plants, new truck and SUV programs, supplier activity and investment in retooling would provide more immediate evidence of additional freight. Fuel prices, tariffs, interest rates and any legal challenge to the CAFE reset could also affect the timing and size of any production response.

For now, the standards reset is a modest positive for domestic auto manufacturing, but not a near-term freight catalyst. The 2026 truckload market remains a capacity story: accepted volume is flat to down while tender rejections have nearly tripled. Any meaningful demand-driven improvement will first have to show up in the auto markets through more accepted freight, not simply more rejected tenders.