Motor vehicle with pressurised tank and supporting element

A motor vehicle comprising a pressure tank (1) and a support element (2), wherein the support element (2) supports the pressure tank (1), wherein the support element (2) is designed as a lower half-shell, so that the support element (2) at least partially surrounds the underside of the pressure tank (1), wherein the support element (2) follows the contour of the pressure tank (1), wherein the support element (2) is fastened to the body (3) of the motor vehicle, so that the support element (2) stiffens the body (3).