2025 Hd Duramax 2025 Mpg. 2025 chevrolet silverado hd 6.6 duramax diesel updated: 2025 chevrolet silverado hd zr2 first ever heavy duty offroad truck, 2025 duramax problems on peta marilyn, according to customer satisfaction program.

I have found on my duramaxes that mpg tends to continually increase to around 30,000 miles. My average mpg in 5000 miles is 17.4 hand calculated with an average speed of 40.3 mph.