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A Study of Energy Losses in the World's Most Fuel-Efficient Vehicle

Patrick Grady, Gerry Chen, Shomik Verma, Aniruddh Marellapudi, Nico Hotz

IEEE Vehicle Power and Propulsion Conference (VPPC) 2019


The prototype fuel cell electric vehicle (FCEV) Maxwell currently holds the Guinness World Record for “Most Fuel-Efficient Vehicle” at 6,196 km/l (14,573 MPGe). The vehicle draws less than 21W of electrical power at 25 km/h. This work outlines the powertrain architecture and presents the vehicle’s sources of electrical and mechanical losses, quantified through rigorous experimentation. The individual components are modelled and combined into a total model of performance representing all energy flow in the vehicle. The total model is found to have excellent predictive power with only 4.3% error compared to measured on-track performance.

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