2024 Chevy Duramax High Country Mpg. Current truck is a 2014 duramax with the 6 speed. Did not burn any oil and def consumption was 1/2 tank for 2433 miles.

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. L5p can get as low as 6 mpg towing, or some have seen 13 mpg, all depends on weight, wind resistance, and terrain.