I have a 21 GMC Sierra AT4 with the 3.0. My fuel range per tank is somewhere between 800 to 820ish per tank. I usually fuel up close to 750 miles. I get between 30-34 mpg driving back and forth to work about 84 miles a day. Great low end and mid range torque, it lacks upper end pull of gas but it’s still no slouch. Quiet and refined for a diesel. Def range without towing is about 10k per 5 gallon tank, if you tow it will be less than that. If your driving like you want good fuel economy you will see it, but if you drive it like a 20yr old male who likes to have fun your mileage will suffer. Definitely glad I chose this engine even over the 6.2 due to fuel prices and performance. Edit….. 7qts of oil and filter change at my dealer is in the $80 range. Def prices at the pump are around $3 a gallon in Pa. Out of the jug online prices are at least $5 a gallon.
Last edited by sako4me; 10/24/21.
