The XR3 Personal Transit Vehicle (PTV) is a super-fuel-efficient two-passenger plug-in hybrid that achieves 125 mpg on diesel power alone, 225 mpg equivalent when diesel and electric power are used in series, and performance like a conventional automobile. The design of the XR3 Hybrid is based on existing technologies and a vehicle "personality" that makes conserving energy a fun driving experience. It showcases the design ideas explored in Robert Q. Riley's book, "Alternative Cars in the 21st Century".
