The Hummer HX is a concept Off-road vehicle/Compact SUV revealed on January 8, 2008 and manufactured by General Motors. The vehicle is smaller than both the H2 and H3 and is powered by a 3.6 L (~220 cu in) SIDI V6 that is E85 FlexFuel capable. A 2.4 L (~146 cu in) SIDI 4 cylinder option would likely be available as well, making it the very first Hummer with a four-cylinder engine. More compact than a HUMMER H3 -- 81 inches (2057 mm) wide, with a 103-inch wheelbase (2616-mm) -- the HX concept is an open-air, two-door off-road vehicle. Its design is based on the ideas developed by a trio of young designers who are new to the HUMMER studio. The HX was shown with a slant-back configuration, wearing a desert-inspired matte olive paint scheme, at the North American International Auto Show. Additional convertible features include: Removable doors -- easily removable pins in the exposed hinges allow the doors to be removed quickly -- an appreciated feature of many serious off-roaders Removable fender flares -- attached with quarter-turn quick-release fasteners, the composite fender flares can be quickly removed for additional trail/rock clearance, or if the flare is damaged during off-road driving The vehicle will not go into production, as GM has closed the entire Hummer brand. However, some of the features of the H4, such as Underpinning and components, will be used in the redesigned 2012 Chevrolet Colorado/GMC Canyon.