General Motors has added an eight-speed automatic transmission to its 2015 GMC Yukon Denali and Yukon Denali XL models that improves fuel economy from the six-speed offered with the 2014 models.
by Staff
November 6, 2014
Photo of GMC Yukon XL Denali courtesy of GM.
2 min to read
Photo of GMC Yukon XL Denali courtesy of GM.
General Motors has added an eight-speed automatic transmission to its 2015 GMC Yukon Denali and Yukon XL Denali models that improves fuel economy from the six-speed offered with the 2014 models.
The large SUVs will improve their EPA-rated fuel economy by about 15 percent, when the new 8L90 transmission is paired with the 6.2-liter EcoTec V-8 carried over from the 2014 model year. GM also offers a 5.3-liter V-8. Fuel economy improvement will vary slightly with the rear-wheel and four-wheel drive models.
Ad Loading...
The rear-wheel 2015 Yukon Denali achieves an EPA-rated 22 mpg highway, 15 mpg city, and 17 mpg combined. The four-wheel model achieves 21 mpg highway, 15 mpg city, and 17 mpg combined.
The four-wheel 2014 Yukon Denali achieved an EPA-rated 18 mpg highway, 13 mpg city, and 15 mpg combined, while the rear-wheel model achieved 18 mpg highway, 14 mpg city and 16 mpg combined.
The new 8L90 transmission provides a wider gearing spread that allows for the use of a 3.23:1 rear axle ratio, which reduces engine speeds and fuel consumption especially during highway cruising.
Tow ratings are unaffected by the move. The Yukon Denali can haul 8,400 pounds, while the Yukon XL Denali can tow 8,100 pounds.
GM has set retail pricing on the models at $64,965 for the Yukon Denali and $67,665 for the Yukon XL Denali. The vehicles have arrived at dealerships.
Kooner Fleet Management Solutions’ new Central England operations hub establishes a foundation for 24/7 fleet maintenance, mobile repair, and technician development across the UK.
Drivers are shaping fleet decisions, TPMS is delivering real savings, and a key workhorse is retiring. Plus quick hits on data, uptime, and new trucks.
St. Christopher Truckers Relief Fund’s 2nd Annual Virtual 5K raises funds and awareness for over-the-road truck drivers facing illness or injury, and there’s still time to participate in this year’s event.
New tools always change the process. They do not replace the instinct. From portrait painters adapting to photography to creators navigating AI, the people who matter most are still the ones who know how to see.
With more than four decades of experience across fleets such as AT&T and AmeriGas, Carl built a reputation for doing the work, leading through change, and helping to move the industry forward without ever making it about himself.
In this month’s news recap, we’re digging into why trucks are still failing in the field, how fleets are finally turning data into action, why driver feedback is becoming a critical operational tool, how fleet leaders are finding their voice, and where simple tech like TPMS is delivering real results.
Verisk CargoNet reported that supply chain crime events across the United States and Canada declined by 5.3% in the first quarter of 2026. However, confirmed cargo theft reports rose slightly, by 41 incidents.
Limited spots remain for Work Truck Exchange in Phoenix. Fleet managers can connect through pre-scheduled meetings designed to deliver real solutions fast.
Veterans in fleet, it's your turn! share how military experience shapes leadership, discipline, and real-world decision-making across today’s operations.
