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.