One potential contributor to mitigating the CO2 emissions caused by road transport is eco-driving. Ecodriving encompasses all driver behaviors performed to reduce the vehicle's energy consumption. Drivers' optimal on-road interaction with the kinetic energy resources is particularly relevant for eco-driving success. Hence, the question is what information do drivers require to optimally interact with the kinetic energy resources? We conducted ten interviews with hybrid electric vehicle (HEV) eco-drivers who actively interact with kinetic energy resources on a daily basis. From these interviews, a set of information requirements was derived. Further steps will comprise the development and testing of an interface prototype based on these information requirements.