2025 Chevy Duramax Diesel Fuel Economy. Also suspect, after logging 300 miles of mostly highway towing, we calculated a fuel economy of just 10.5 mpg. Come join the discussion about modifications, towing, classifieds,.

The 2025 chevy silverado zr2’s duramax diesel engine has proven efficient, but we weren’t ready for its astonishing best tank of 34 mpg with 826 miles of range! “these new pumps have a pumping capacity of 2,200 bar,” banks said.