Mack says its MP13 engine is EPA '27 compliant

Mack Trucks Tuesday at the ACT Expo in Las Vegas said its MP13 powertrain has been re-engineered to meet stringent EPA 2027 emissions standards while also getting a performance boost for both highway and vocational applications. 

The new MP13 will deliver up to 540 horsepower and 1,950 lb.-ft. of torque, but beyond raw power, the engine increases braking horsepower by more than 20%, reaching 630 braking hp for improved stopping capability.

[Related: Volvo debuts industry's 'most powerful, most reliable, most fuel efficient' engine]

To meet the 2027 federal standards, Mack Senior Vice President Govi Kannan said engineers focused on more complete combustion cycles to reduce CO2, soot, and particulate matter. "This will be our strongest 13-liter that we have built," Kannan said. The cost of compliance, Kannan said, is expected to be roughly $10,000 over the prior generation engine. 

The engine is paired with an updated mDRIVE automated manual transmission, featuring enhanced engine-to-transmission communication for faster shifting. Advanced predictive software and an optimized torque curve—peaking as low as 900 RPM—further support fuel economy through downspeeding.

The efficiency gains vary by model. While the MP13 offers a 3% fuel improvement in the Mack Pioneer, Anthem, and Granite models, it reaches a 6% efficiency increase in the all-new Mack Keystone compared to its predecessor, the Pinnacle. Mack officials noted the Keystone’s gains were achieved without sacrificing the off-road versatility required for vocational work.

The new MP13 now supports biodiesel blends up to B20, an increase from the previous B10 limit, and remains fully compatible with renewable diesel (R100).

The EPA 2027-compliant MP13 will be available for order in August 2026. Production is scheduled to align with the rollout of model year 2028 vehicles across Mack’s entire long-haul and vocational lineup.