The environmental impact of a vehicle calculated with life cycle assessment is often shown as one single value. This approach approximates the environmental impact of one vehicle, but fails to provide decision-makers with a wide view on the possible effects of their decisions. The complexity, uncertainty and variability of the system are not well approximated with one single value. For instance, when choosing one single car and compare it with one other car, the full quality of the comparison falls or stands with the chosen set of vehicles. The variation of one single parameter such as fuel consumption or the weight of a car within one given vehicle technology and segment can lead to different results and interpretations. It is therefore essential to take into account the influence of the vehicle parameters on the LCA results.