Toyota is advancing hydrogen-powered vehicle technology with a liquid hydrogen system design that includes a self-pressurizer to increase engine efficiency. In the GR Corolla H2 Concept, the system keeps hydrogen at -253 degrees Celsius during filling and storage. Despite the challenge of boil-off gas wastage, Toyota introduced a self-pressurizer at a recent race event, utilizing the pressure of the boil-off gas to produce reusable fuel without extra energy. This method may further enhance fuel efficiency by powering the hydrogen pump motor with any additional boil-off gas. Dr. Jacob Leachman from Washington State University commended Toyota's innovation, stating that the development of a hydrogen pump that utilizes cold energy for compression is a crucial advancement for cold hydrogen vehicles. Liquid hydrogen vehicles pose technical challenges, including hydrogen pump failures and pressure increases when hydrogen boils. By addressing these challenges, Toyota's liquid hydrogen system design demonstrates a significant step forward in the utilization of hydrogen as a fuel source for vehicles.