Eco-driving plays a crucial role in the optimal use of electric buses in local public transport. Human-Machine-Interfaces (HMIs) can support eco-driving but have to meet specific user requirements. We developed an indicator-based eco-driving interface prototype and then conducted an interview study with electric bus drivers (N = 10) to examine their perspectives regarding key features of eco-driving interfaces. Based on drivers’ statements, interfaces should specifically highlight whether the driving behavior is currently lying within an acceptable range of energy efficiency rather than highlight exceptional driving behavior. Furthermore, this feedback should always be based on an adequate amount of reference data from routes that allow for comparability. Interfaces’ overall information volume should be reduced and provide feedback about fewer and appropriate indicators.