Vehicles with a gross vehicle weight rating over 8,500 pounds like our 2022 GMC Sierra 2500 mpg test vehicle aren’t brought to trial by the EPA. Stephen Edelstein at GreenCarReports.com says, “When these standards were first drafted, decades ago, it was inconceivable that individual consumers would buy such large vehicles for any kind of personal use.” Believe it or not, in the writer’s home state it is very common to see owners commute with their diesel Super Duty, RAM HD, or GM HD and tow only once a month. DailyMotor is here to report and later compare the GMC Sierra 2500 diesel fuel economy all so consumers considering this beast of a truck as a daily driver can budget accordingly.
After our test of the GMC Sierra 2500 diesel fuel mileage, we found this heavy-duty pickup to travel 20 miles per gallon. A modest result considering these trucks weigh anywhere from six to seven thousand pounds. The fuel tank capacity of our GMC Sierra 2500 mpg test vehicle is 36 gallons, so a 720 mile range is expected while bobtailing. Stay tuned for future tests as we compare our GMC Sierra 2500 mpg result to its Ford and Ram competitors! Click here to read our 2022 GMC Sierra 1500 mpg test.
Watch Our GMC Sierra 2500 Diesel Fuel Economy Test
How We Test the GMC Sierra 2500 Diesel Fuel Mileage
This Daily Motor 2022 GMC Sierra 2500 mpg test consists of just over 50 miles of consistent highway driving. We fill our GMC Sierra 2500 diesel fuel economy test vehicle with diesel using the “three-click method,” meaning running the diesel pump on high flow until it clicks off, waiting ten seconds, running low flow until it clicks off again, waiting another ten seconds, then running low flow one very last time. We then drive about 25 miles on public highway in one direction and then back in the opposite direction, attempting not to draft or drive aggressively. We set the cruise control during our at a GPS-indicated 72 mph in an attempt to achieve a moving average speed of 70 mph over the entire test. Upon return to the gas station, we refill at the same fuel pump as the initial fill using the same fueling method. Miles per gallon is determined by dividing total miles traveled by fuel used. In cases where our GMC Sierra 2500 diesel fuel economy observed figure differs greatly from the vehicle’s indicated figure and/or EPA’s estimate, we may recommend a number in between or plan to retest the vehicle. Thanks for reading our test of the 2022 GMC Sierra 2500 diesel fuel mileage!