2021 Toyota Mirai XLE: MPG and fuel economy

This page collects every fuel-economy figure the EPA publishes for the 2021 Toyota Mirai XLE. Below you will find the headline combined, city, and highway MPG, the estimated annual fuel cost at three different driving levels, the tailpipe CO₂ emissions, and a full breakdown of the engine and drivetrain. If you want to know whether this generation got more or less efficient over the years, the year-over-year table further down covers every model year the EPA has rated.

Fuel economy at a glance

These are the EPA's official ratings for the 2021 Toyota Mirai XLE. The numbers come from a standardised laboratory test cycle and are the same figures that appear on the window sticker of every new car. Real-world mileage varies with driving style, weather, fuel quality, and how heavily loaded the car is.

Combined MPG is a 55/45 weighted blend of the city and highway test cycles. The EPA uses it as the single number you can compare across the entire dataset, including hybrids and EVs (which use the equivalent MPGe figure).

How the 2021 Toyota Mirai XLE compares

The 2021 Toyota Mirai XLE returns 74 combined MPG. Cars in the Compact Cars class for the same model year average 30 MPG, which puts this car ahead of the class average by about 147%.

The most efficient car in the Compact Cars class for the 2021 model year is the Kandi K27 at 114 MPG. The bar chart below puts the Toyota Mirai XLE alongside the class best and the class average so you can see the full picture.

For broader context, the average new car of the 2021 model year (across all classes) returns 27.9 MPG. Larger vehicles pull the all-cars average down, so do not use that figure on its own to judge a small car or a hybrid. The full list of the most efficient cars of the 2021 model year is on its own page.

Year-over-year MPG for the Toyota Mirai XLE

The EPA has rated the Toyota Mirai XLE across 5 model years, from 2021 Toyota Mirai XLE through 2025 Toyota Mirai XLE. The numbers below are the best combined MPG figure the EPA published for each year, which lets you see when the car was at its most efficient and how recent generations stack up.

Combined MPG has stayed in roughly the same range across the run, hovering close to 74 MPG.

Compare against other Compact Cars for 2021

If you are cross-shopping the 2021 Toyota Mirai XLE, the most useful comparison is against the other cars in the Compact Cars class for the same model year. The list below shows the highest-MPG peers, ranked from most to least efficient. Click any of them to open its full page.

The Kandi K27 leads this group at 114 MPG, 40 MPG ahead of the 2021 Toyota Mirai XLE.

Specifications

Engine, transmission, and drivetrain together drive most of the variation in fuel economy across trims. A larger engine moves the car with less effort but burns more fuel. A turbo lets a small engine punch above its weight, often without much MPG penalty. All-wheel drive adds traction and weight, and usually costs a couple of MPG compared with two-wheel drive of the same engine.

Vehicle class

Compact Cars

Transmission

Automatic (variable gear ratios)

Drivetrain

Rear-Wheel Drive

Fuel type

Hydrogen

Annual petroleum use

2 barrels per year

Common questions about the 2021 Toyota Mirai XLE

Quick answers to the questions people most often search for when looking up the 2021 Toyota Mirai XLE.

• Is the 2021 Toyota Mirai XLE fuel efficient?

  Yes. The 2021 Toyota Mirai XLE returns 74 combined MPG, which beats the average car in the Compact Cars class for the same model year by about 147%.
• What MPG does the 2021 Toyota Mirai XLE get?

  The EPA rates the 2021 Toyota Mirai XLE at 74 combined MPG, 76 MPG in city driving, and 71 MPG on the highway. Real-world numbers depend on your driving style, the weather, and how loaded the car is.
• How much does it cost to fuel a 2021 Toyota Mirai XLE per year?

  The EPA estimates an annual fuel cost of $0 for the 2021 Toyota Mirai XLE. That figure assumes 15,000 miles of driving per year, a 55% city and 45% highway split, and the EPA's published average fuel price for the rated fuel grade.
• What fuel does the 2021 Toyota Mirai XLE use?

  The EPA lists the 2021 Toyota Mirai XLE as running on hydrogen. Using a different grade than the manufacturer specifies can affect fuel economy and engine longevity.
• Has the Toyota Mirai XLE become more fuel efficient over time?

  Combined MPG has stayed close to flat across the run. Both the earliest (2021 Toyota Mirai XLE, 74 MPG) and most recent (2025 Toyota Mirai XLE, 74 MPG) versions sit in the same range.
• What is the difference between the city and highway MPG of the 2021 Toyota Mirai XLE?

  City driving returns 76 MPG and highway driving returns 71 MPG. A flat (or city-better) split is the signature of a hybrid or electric drivetrain, where regenerative braking recovers energy that would otherwise be lost in stop-start city traffic.
• What transmission and drivetrain does the 2021 Toyota Mirai XLE have?

  The 2021 Toyota Mirai XLE comes with a automatic (variable gear ratios) transmission and rear-wheel drive.
• How does the 2021 Toyota Mirai XLE compare to the best car in its class?

  The most efficient car in the Compact Cars class for the 2021 model year is the Kandi K27 at 114 combined MPG. The Toyota Mirai XLE returns 74 MPG, a gap of 40 MPG. If you are comparing on fuel economy alone, the class leader is worth a look.
• How much does the 2021 Toyota Mirai XLE save on fuel compared to an average car?

  The EPA estimates that over five years, the 2021 Toyota Mirai XLE will save you about $10,750 in fuel compared with an average new vehicle of the same model year. That figure uses the same 15,000 mile per year and EPA fuel-price assumption as the annual fuel cost.
• How much petroleum does the 2021 Toyota Mirai XLE use per year?

  The EPA estimates the 2021 Toyota Mirai XLE consumes about 2 barrels of petroleum per year, based on the standard 15,000 miles of driving. A barrel is 42 U.S. gallons of crude oil, which is refined into gasoline plus other products.

Source: U.S. EPA fuel economy dataset. Annual fuel cost figures assume 15,000 miles of driving per year and a 55% city, 45% highway split. Real-world mileage varies with driving conditions, vehicle maintenance, fuel quality, and driver behaviour.