Mack Trucks used ACT Expo 2026 to highlight a new version of its MP13 engine, positioning the powertrain as a bridge between tougher emissions regulations and the performance demands of highway and vocational fleets.
The company announced that the Mack MP13, which Mack calls the most powerful and efficient engine it has ever produced, will be compliant with EPA 2027 emissions standards. The new MP13 delivers up to 540 horsepower and 1,950 lb.-ft. of torque, while improving fuel efficiency by up to 3% compared with previous MP13 engines. Mack also increased engine braking performance to as much as 630 braking horsepower, a more than 20% improvement over the prior version.
The updated engine is paired with Mack’s mDRIVE automated manual transmission, which Mack said provides faster engine-to-transmission communication for quicker, smoother shifts. The powertrain also features an optimized torque curve that delivers peak torque as low as 900 rpm, supporting improved drivability and downspeeding.
For fleets preparing for the 2027 regulatory shift, Mack framed the MP13 as a way to meet stricter emissions standards without sacrificing the power and operating efficiency needed across demanding duty cycles. The engine meets EPA 2027 requirements through enhancements designed to support more complete combustion and lower engine-out CO2, soot and particulate matter. It also includes a more efficient turbocharger and advanced predictive software that smooths engine response to driver demands.
“The MP13 represents years of engineering work to deliver an engine that meets the toughest emissions standards in our industry’s history, but does so without asking our customers to compromise on power or efficiency,” said Jonathan Randall, president of Mack Trucks North America. “Mack customers depend on us to keep them moving, and the EPA 2027 MP13 is built to do exactly that.”
The engine also expands Mack’s lower-carbon fuel flexibility. The EPA 2027 MP13 is compatible with renewable diesel and biodiesel blends up to B20, an increase from B10 on the previous MP13. That gives fleets more options to reduce lifecycle emissions where renewable fuel supply is available, while continuing to use familiar diesel engine platforms and fueling infrastructure.
Mack said the EPA 2027 MP13 will be available across its highway and vocational lineup. In the Mack Pioneer and all-new Mack Anthem, the engine is designed to deliver the efficiency long-haul fleets need. In the all-new Mack Granite, the MP13 brings up to 3% improved fuel efficiency compared with the previous engine in vocational applications. In the all-new Mack Keystone, the engine helps deliver up to 6% improved fuel efficiency compared with the Mack Pinnacle, while maintaining the terrain versatility the Keystone is built to provide.
The launch also reflects a broader theme across ACT Expo this year: fleets are not looking at emissions compliance in isolation. They are weighing technology choices against total cost of ownership, uptime, power, fuel flexibility and application fit. Mack’s updated MP13 keeps internal combustion in that conversation by pairing regulatory readiness with incremental efficiency gains and added performance.
The EPA 2027 MP13 will be available for order beginning in August 2026, with production timed to model year 2028 vehicles.
