EV range extender: Better mileage than plug-in hybrid?

This paper shows that EV range-extender (RXT) will provide better mileage than the plug-in hybrid (PHEV) when a model usage of vehicle is applied. The model is assumed to be: 30 km (6 days a week), 100 km (1 day a week). A RXT system was made for this evaluation using a pure EV and an electric generator on a trail. Japan 10–15 mode is used for the calculation. The result shows that 35.4 kWh/weeks is obtained for RXT, while 36.5 kWh/week for PHEV. This would be the first evaluation of RXT based on the fuel economy.