GM has released new EPA fuel economy numbers for its newly refreshed and upgraded Chevrolet and GMC full-size SUVs, and they're leading the segment. The 2015 Chevy Tahoe/Suburban and GMC Yukon/Yukon XL will come standard with the EcoTec3 all-aluminum 5.3-liter V-8 that debuted in the all-new 2014 Chevy Silverado and GMC Sierra half-ton pickup trucks last year. The new engine produces more power and offers better city and highway fuel economy than either of the previous 5.3-liter V-8 engines (LC9 or LMG) it replaces.
According to the press release, the new EPA-rated numbers for the Chevy Suburban (and GMC Yukon XL) are 16 mpg in the city and 23 mpg on the highway for two-wheel-drive models, improving the previous engine's numbers by 7 and 9 percent, respectively. Four-wheel-drive models for both the 2015 Yukon XL and Suburban are 15/22. Shorter wheelbase Tahoe and Yukon models with two-wheel drive have an EPA rating of 16/23, with four-wheel-drive models rated at 16/22.
Additionally, all GMC Yukon Denali models will include the new EcoTec3 6.2-liter V-8 that offers vastly improved city/highway mileage numbers from 14/18 to 15/21 mpg (two-wheel drive) with the addition of variable valve timing, direct injection and cylinder deactivation.
Fuel economy improvements are also coming to the newly redesigned 2015 Ford Expedition and Expedition EL, as Ford has replaced the dated 5.4-liter V-8 with the more powerful and efficient 3.5-liter twin-turbo EcoBoost V-6 engine. EPA fuel economy ratings for the EcoBoost 3.5-liter have not been released yet, but it's likely to show much better fuel efficiency than the engine it's replacing. No changes have been announced to the Toyota Sequoia, which offers 13/17 mpg city/highway, or the Nissan Armada, which offers 13/19 mpg city/highway EPA ratings.