How much hydrogen does the Toyota Mirai hold?
The Toyota Mirai stores about 5 kilograms of hydrogen onboard, housed in three high-pressure tanks at roughly 700 bar. This configuration typically supports a driving range near 400 miles under favorable conditions.
Hydrogen storage design
The Mirai’s onboard hydrogen system is built around three high-pressure tanks that are integrated into the vehicle’s underbody and rear areas. These tanks are engineered to hold a total of about 5 kilograms of hydrogen when full, and are pressurized to around 700 bar (approximately 10,000 psi).
- Three high-pressure tanks provide a combined storage capacity of about 5 kilograms of hydrogen.
- Tanks are pressurized up to 700 bar to maximize energy density in a compact space.
- Tank construction uses carbon-fiber-reinforced composites for strength and lightweight performance.
- Location and integration are designed to preserve vehicle balance and safety while allowing a practical trunk and cabin layout.
These design choices aim to deliver a practical driving range in everyday use while enabling relatively quick refueling at compatible hydrogen stations.
Capacity, range, and model-year variations
Across generations, the Mirai’s hydrogen capacity remains close to five kilograms, but range estimates have evolved with model updates and improved efficiency. Recent models are rated to travel around 400 miles on a full tank under standard conditions, with real-world range affected by temperature, driving style, climate control use, and payload.
- Total hydrogen capacity: about 5 kilograms (roughly 11 pounds) in 700-bar tanks.
- Estimated driving range: typically around 350–400 miles per fill for newer models, with variations by year and trim.
- Refueling time: hydrogen fills at hydrogen stations usually take 3–5 minutes, similar to gasoline refueling in duration.
In practice, drivers may see ranges differing from the official estimates based on weather, terrain, and how aggressively the vehicle is driven, but the 5 kg capacity underpins the Mirai’s ability to cover long distances between fills.
Refueling infrastructure and safety considerations
Hydrogen fueling for the Mirai relies on specialized stations that deliver hydrogen at high pressure. The system is designed with safety as a priority, featuring automatic shutoffs, leak detection, and crash-tested tanks to minimize risk in everyday use.
- Refueling pressure is standardized around 700 bar to maximize fill efficiency and range.
- Typical fill times are comparable to gasoline vehicles at compatible stations, roughly 3–5 minutes.
- Safety systems include robust tanks, reinforced containment, and multiple sensors to monitor pressure and leaks.
As hydrogen fueling infrastructure continues to expand, Mirai owners benefit from broader access to stations in urban areas and along major travel corridors, enhancing the vehicle’s practicality as a zero-emission option.
Summary
In summary, the Toyota Mirai holds about 5 kilograms of hydrogen in three high-pressure tanks, pressurized at around 700 bar. This configuration enables a typical range near 400 miles under favorable conditions, with fueling times comparable to conventional refueling at properly equipped stations. Range and efficiency can vary with model year, weather, and driving conditions, but the hydrogen storage setup remains a core feature that defines the Mirai’s zero-emission performance.
