The redesigned 2021 GMC Yukon gets a modest bump in fuel economy but big gains in towing capacity, GMC announced Monday.

Despite getting larger and loaded with more equipment for 2021, the full-size SUV nets a boost of 1 mpg over the outgoing model on most variants, with an EPA-rated 16 mpg city, 20 mpg highway, 18 mpg combined for Yukon’s with the 355-horsepower 5.3-liter V-8 in rear- or four-wheel drive. The longer Yukon XL with four-wheel drive is rated at 15/19/17 mpg.

The Yukon Denali with a 420-hp 6.2-liter V-8 didn’t fare as well for 2021; the city rating increased by 1 mpg to 15/20/17 in rear-wheel drive, but the highway and combined mpg in four-wheel-drive fell to 14/19/16 mpg from last year’s 14/22/17 mpg.

GMC and the EPA haven’t yet released fuel-economy figures for what should be its most efficient powertrain, a 277-hp 3.0-liter turbodiesel inline-6. That info is…

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