2025 Duramax Mpgh. For 2025, the silverado 2500 maxes out at 22,430 pounds with a gooseneck hitch. Information about gm's 6.6l turbo diesel v8 duramax lml engine used in the chevy silverado hd and gmc sierra hd,.

The 2025 silverado 2500 duramax diesel achieved a result of 18 mpg in our testing. The truck’s l5p duramax diesel engine received a substantial bump in power and torque thanks to a stout list of upgrades, including a new turbocharger, improved piston design, enhancements to the.