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Non-coherent electronic transport in metallic nanowires exhibits differentcarrier temperatures for the non-equilibrium forward and backward populationsin the presence of electric fields. Depending on the mean free path thatcharacterizes inter-branch carrier backscattering transport regimes varybetween the ballistic and diffusive limits. In particular, we show that thesimultaneous measurements of the electrical characteristics and the carrierdistribution function offer a direct way to extract the carrier mean free patheven when it is comparable to the conductor length. Our model is in goodagreement with the experimental work on copper nanowires by Pothier {\it etal.} [Phys. Rev. Lett. {\bf 79}, 3490 (1997)] and provides an elegantinterpretation of the inhomogeneous thermal broadening observed in the localcarrier distribution function as well as its scaling with external bias.

Carrier mean free path and temperature imbalance in mesoscopic wires