Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Hummer HX is a concept Off-road vehicle/Compact SUV revealed on 8 January 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 (2,057 mm) wide, with a 103- inch wheelbase (2,616-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 vehicle was featured in Transformers: Revenge of the Fallen. The vehicle is likely not going into production since GM is closing the entire Hummer brand. Instead, the underpinnings will be used in the redesigned 2012 Chevrolet Colorado/GMC Canyon.