There were few models that were marketed under the brand of Hummer: H1 (civilian version of Humvee), H2 (second vehicle released by Hummer) and H3 (smallest car of all Hummer models). There were also Hummer HX concept car created in 2008. All vehicles that were build as a mid or large SUVs, received high engine displacements varying from 5.7 L to 6.6 L for H1, 6.0 L and 6.2 L for H2 and 3.5 L – 5.3 L for H3 model.