Knowledge of the upcoming traffic velocity along a route can help in many respects, among them optimizing energy management for hybrid vehicles, which, for instance, could reduce instantaneous battery usage if a traffic jam is upcoming in the next future. While such kind of knowledge can hardly be precise on a single-vehicle level, we show in this paper that a prediction method which combines present and past Vehicle-to-Everything (V2X) information can strongly improve the energy efficiency. Our approach is first compared with other prevailing prediction methods and its advantages in terms of stability and accuracy are shown. Then the prediction results are applied in a hybrid powertrain control example, in which its potential in fuel savings are illustrated.