2018 GMC Sierra 2500HD Denali

While we try our best to break up these reports by quarter and keep a relatively even number of miles in each one, sometimes it just doesn’t work out.

- Jason Gonderman

In the previous report we covered more than 7,000 miles, while in this one we hit just over 3,000. Regardless of that, we’re still learning a lot about our 2018 Pickup Truck of the Year award-winning GMC 2500HD Denali.

As the previous report period closed and this new one began, the Sierra alerted us that is was time for not only another refill of exhaust fluid but also an oil change and fuel filter replacement. All of these service intervals are calculated by the truck’s computer based on usage and we’ve found that we’re hovering right around average. The typical oil change interval is 7,500 miles and fuel filter life should be about 15,000. Exhaust fluid is trickier, and while it should last about the same as an oil change we’ve found that the truck continues to consume the fluid at a rate of about seven gallons every 6,000 miles. If you frequently tow heavy loads, expect that number to go down. Fuel economy is averaging around 14.5 mpg, though that doesn’t vary whether empty or loaded with a 10,000-pound trailer.