Two V-8 engines—a 5.3-liter unit with 355 horsepower and a 6.2-liter unit with 420 horsepower—power the 2023 GMC Yukon. The best choice for a heavier load is the 3-liter turbo-diesel inline-six, which is also an option. A 10-speed automatic transmission with rear- or all-wheel drive is mated to each of them. The AT4 variant is equipped with 20-inch all-terrain tires, an optional air suspension, a 2-speed transfer case, and underbody skid plates, making it suitable for off-road driving. First V-8 achieves 16/20 mpg, second V-8 achieves 14/20 mpg, and diesel achieves a respectable 21/27 mpg