74 MPG combined. That’s the headline figure for the 2023 Toyota Mirai XLE, and it’s a number that needs explanation. This isn’t a gasoline-powered car; it’s a hydrogen fuel cell electric vehicle (FCEV). That impressive number represents its equivalent fuel economy, how far the Mirai can travel on the energy equivalent of one gallon of gasoline. For buyers in California, this technology, combined with government incentives and manufacturer-provided hydrogen fuel cards, is an attractive option because of the lower fuel costs.

City and highway performance

The combined figure grabs attention, but understanding the Mirai’s city and highway performance gives a more complete picture. Its EPA ratings show 76 MPG in the city and 71 MPG on the highway. The slight advantage in city driving comes from how electric powertrains, including fuel cell systems, work. When the car decelerates, some kinetic energy is captured and converted back into electricity, boosting efficiency in stop-and-go traffic. The highway figure, while still excellent, dips a bit because of the constant energy draw required to maintain higher speeds. These figures represent the XLE trim. Check the MIRAI MPG across all years to compare.

Annual Fuel Cost

The U.S. EPA estimates the annual fuel cost for the 2023 Toyota Mirai XLE at $709. This calculation is based on driving 15,000 miles per year and using national average fuel prices. However, the “fuel” in this case is hydrogen. Toyota offers a substantial credit towards hydrogen fuel for lease customers and some purchase customers, often covering a significant portion of the actual fueling cost. The $709 figure provides a relative benchmark, but it’s unlikely to represent the real-world spending of most Mirai owners given the incentives.

Real-world expectations

The EPA numbers provide a standardized benchmark, but as with any vehicle, real-world fuel economy can vary. Factors like driving style, ambient temperature, terrain, and cargo weight can all influence efficiency. Fast acceleration and frequent hard braking will deplete the hydrogen fuel reserves more quickly. Extremely cold temperatures can also reduce the system’s efficiency, as fuel cells perform best within a specific temperature range. Despite this, many Mirai owners report achieving numbers close to the EPA estimates, particularly in urban driving scenarios.

How it compares

When looking at the Mirai’s efficiency, it’s important to consider its rivals. The Hyundai Nexo, another hydrogen fuel cell vehicle, achieves an EPA-estimated 61 MPG combined. The Mirai has higher MPGe, but the Nexo often has more readily available hydrogen fueling locations, depending on the region. Also, compare Toyota’s fuel cell MPG estimates with all of all Toyota fuel economy data. Considering battery electric vehicles (BEVs), the Tesla Model 3 Long Range achieves around 132 MPGe combined, highlighting the efficiency of BEVs and showing the technological trade-offs being made. The Mirai buyer isn’t solely focused on optimizing MPGe; they’re making a statement about sustainability and embracing an alternative fuel source, even if it comes with infrastructural limitations.

Tips to maximize efficiency

Drive smoothly. Fuel cell vehicles, like all electrified cars, benefit from gentle acceleration and deceleration. Avoid sudden bursts of speed or hard braking, as these actions consume more energy. Watch traffic and maintain a steady pace when you can.

Maximize regenerative braking. The Mirai uses regenerative braking to capture energy during deceleration. Learn to control the brake pedal to maximize the regenerative effect, reducing the need to use the friction brakes. This will help to extend the overall range of the vehicle before refueling.

Pre-condition the cabin. Heating or cooling the cabin while the vehicle is plugged in can reduce the load on the fuel cell system once you start driving. Use the Mirai’s pre-conditioning feature to bring the cabin to your desired temperature while the vehicle is still connected to the charger. This will help conserve hydrogen fuel and improve overall efficiency.

Maintain proper tire inflation. Check your tire pressure regularly and ensure that your tires are inflated to the manufacturer’s recommended specifications. Underinflated tires increase rolling resistance, which reduces fuel economy and accelerates tire wear. Proper tire inflation ensures efficiency and extends tire life.

Minimize aerodynamic drag. Remove any unnecessary items from the roof rack or cargo carrier, as these can increase aerodynamic drag and reduce fuel economy. Avoid driving with your windows open at higher speeds, as this creates drag. Improving the vehicle’s aerodynamics can improve efficiency, especially on the highway.