The goal was to study how different driving modes affect the energy consumption and driving range of extended-range electric vehicles. They used a vehicle with hybrid and electric modes and tested it under various driving conditions. The study found that driving resistance is a major factor influencing energy use and range. The vehicle had the longest driving range in pure electric mode during the NEDC cycle. In hybrid mode, the engine used the most energy. The study helps understand how these vehicles consume energy and can help develop strategies to manage energy better.