It's not the end of the world... that energy consumption over 5 km, is not really relevant. If you had the Climate control set to a "decent" temperature and the heated seats on, a good chunk of that energy went into heating. The terrain profile is also very important for such a short distance... uphill or downhill.
I wouldn't worry if I were you, unless you see excessively high consumption averaged over longer distances on quasi-flat terrain.