Dimensioning the battery capacity for any kind of electric vehicle a compromise between electric range and costs has to be found. Therefore it is important for manufacturers to obtain characteristic values and profiles concerning user behavior, e.g. average daily driven distances, based on real life data. In this paper, corresponding results of a field test with extended range electric vehicles in Germany are presented. The focus in the field test was on private frequent drivers and users in companies with above average yearly mileages. The results are compared to those of other projects and studies and allow the extraction of consequences for the battery dimensioning.