The 2008 GMC Yukon adds an available gas/electric hybrid model. This report covers the Yukon and half-ton Yukon XL 1500. These large SUVs share their basic designs with the Chevrolet Tahoe and premium Cadillac Escalade. All were redesigned for the 2007 model year. Compared to the Yukon, XL models are about 14 inches longer in wheelbase, 20 inches longer overall, and have nearly 30 cu ft more cargo volume. Yukon and Yukon XL come in SLE, SLT, and luxury Denali models. All are available with rear-wheel drive. SLE and SLT have optional full-time 4-wheel drive that can be left engaged on dry pavement and includes a low-range gear for off-roading. Denalis are available with all-wheel drive without low-range gearing. Standard on 2WD Yukon SLE is a 295-hp 4.8-liter V8 engine. All remaining Yukons and XLs have a 320-hp 5.3-liter V8. Optional on XL is a 366-hp 6.0-liter V8. Yukon Hybrids have a 320-hp 6.0-liter V8 that pairs with an electric motor. These models can run on one or both of their power sources, depending on driving demand and require no plug-in charging. The 5.3- and 6.0-liter engines have GM's Active Fuel Management cylinder deactivation. All these engines use an automatic transmission. Conventional gas models have a 4-speed. Hybrids use a continuously variable transmission (CVT). Yukon Denalis have a 380-hp 6.2-liter V8, 6-speed automatic transmission, and specific interior and exterior trim. Maximum towing capacity is 8200 lb for regular-length models, 8100 lb for XL. Available safety features include ABS, traction control, antiskid system, and curtain side airbags. A power tailgate, power running boards, navigation system, and DVD entertainment are among available features on the 2008 GMC Yukon.