Abstract: A motor vehicle includes a fuel cell and a supply assembly to supply the fuel cell is disclosed. The supply assembly comprises a centrifugal compressor to compress a reagent and comprising an impeller having in turn a shaft portion extending along an inlet axis, a circumferential edge extending ringwise around the inlet axis, a connecting portion extending from the shaft portion to the circumferential edge, first and second blades projecting from the connecting portion, of which each of the second blades is arranged between two corresponding blades to form two respective radial flow channels for the reagent, wherein the first and second blades have respective profiles along respective curvilinear abscissae with shapes equal to each other and located uniformly distributed according to a period or angular step around the inlet axis, wherein the profiles of the second blades are shorter than those of the first blades.