2021 Ford Mustang: MPG and fuel economy
The 2021 Ford Mustang is rated by the U.S. Environmental Protection Agency at 25 combined MPG, with 21 MPG in the city and 32 MPG on the highway. That sits a little below the average car in the Subcompact Cars class for the same model year.
This page collects every fuel-economy figure the EPA publishes for the 2021 Ford Mustang. 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. The EPA rates 5 separate variants of this car (different engine, transmission, or drivetrain combinations), and you can compare them side by side in the trims table. 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.
Key takeaways
- The most efficient car in the Subcompact Cars class for the 2021 model year is the BMW i3 at 113 MPG.
Fuel economy at a glance
These are the EPA's official ratings for the 2021 Ford Mustang. 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.
When the EPA tests several variants of the same nameplate (for example, a front-wheel-drive version and an all-wheel-drive version), each gets its own rating. The figures shown here are the headline variant, taken as the configuration with the best combined MPG. The trims table further down covers all 5 variants side by side.
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).
| Combined MPG | 25 MPG |
| City MPG | 21 MPG |
| Highway MPG | 32 MPG |
| Annual fuel cost | $2,400 |
| Tailpipe CO₂ | 356 g/mi |
| Fuel type | Regular |
How the 2021 Ford Mustang compares
The 2021 Ford Mustang returns 25 combined MPG. Cars in the Subcompact Cars class for the same model year average 26.5 MPG, which puts this car behind the class average by about 6%.
The most efficient car in the Subcompact Cars class for the 2021 model year is the BMW i3 at 113 MPG. The bar chart below puts the Ford Mustang 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.
Trim variants rated for 2021
The EPA rates 5 separate variants of the 2021 Ford Mustang. The differences come from the engine size, transmission type, and drivetrain (front-wheel drive, all-wheel drive, and so on). The same nameplate can land several MPG apart depending on the configuration you actually buy.
The most efficient configuration on this page returns 25 MPG, while the least efficient returns 18 MPG. That is a spread of 7 MPG between trims of the same nameplate.
| Engine and transmission | Drive | Combined | City | Highway | Annual cost |
|---|---|---|---|---|---|
| 2.3L, 4-cyl, turbo, Automatic (S10) | Rear-Wheel Drive | 25 MPG | 21 MPG | 32 MPG | $2,400 |
| 2.3L, 4-cyl, turbo, Automatic 10-spd | Rear-Wheel Drive | 25 MPG | 21 MPG | 32 MPG | $2,400 |
| 2.3L, 4-cyl, turbo, Manual 6-spd | Rear-Wheel Drive | 24 MPG | 21 MPG | 29 MPG | $2,500 |
| 5L, 8-cyl, Automatic (S10) | Rear-Wheel Drive | 19 MPG | 15 MPG | 24 MPG | $3,150 |
| 5L, 8-cyl, Manual 6-spd | Rear-Wheel Drive | 18 MPG | 15 MPG | 24 MPG | $3,300 |
Annual fuel cost across driving patterns
The headline annual fuel cost the EPA publishes assumes 15,000 miles of driving per year and a fuel mix of 55% city and 45% highway. The dollar figure is calculated using the EPA's current reference price for regular gasoline, which is $3.99/gallon. EPA updates that reference periodically rather than tracking live pump prices, so treat it as a window-sticker estimate rather than today's pump number.
The table below scales the EPA's number to three common driving patterns. The combined MPG and the reference fuel price stay constant, only the annual mileage changes. To get a current-prices estimate, take your local gas price and multiply by 600 gallons (the car's annual consumption at the rated MPG).
| Driving pattern | Estimated annual fuel cost |
|---|---|
| Light driver, 7,500 miles per year | $1,200 |
| Average driver, 15,000 miles per year | $2,400 |
| Heavy driver, 25,000 miles per year | $4,000 |
Year-over-year MPG for the Ford Mustang
The EPA has rated the Ford Mustang across 43 model years, from 1984 Ford Mustang through 2026 Ford Mustang. 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. The peak rating came with the 2024 Ford Mustang at 26 MPG.
Compare against other Subcompact Cars for 2021
If you are cross-shopping the 2021 Ford Mustang, the most useful comparison is against the other cars in the Subcompact 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 BMW i3 leads this group at 113 MPG, 88 MPG ahead of the 2021 Ford Mustang.
Specifications
The 2021 Ford Mustang runs a 2.3-liter 4-cylinder turbocharged engine paired with a automatic (s10), sending power through rear-wheel drive.
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
- Subcompact Cars
- Engine
- 2.3L 4-cylinder turbocharged
- Transmission
- Automatic (S10)
- Drivetrain
- Rear-Wheel Drive
- Fuel type
- Regular
- Annual petroleum use
- 11.9 barrels per year
Common questions about the 2021 Ford Mustang
Quick answers to the questions people most often search for when looking up the 2021 Ford Mustang.
-
Is the 2021 Ford Mustang fuel efficient?
It is in line with the rest of the class. The 2021 Ford Mustang returns 25 combined MPG, and the average car in the Subcompact Cars class for the same model year sits at 26.5 MPG. -
What MPG does the 2021 Ford Mustang get?
The EPA rates the 2021 Ford Mustang at 25 combined MPG, 21 MPG in city driving, and 32 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 Ford Mustang per year?
The EPA estimates an annual fuel cost of $2,400 for the 2021 Ford Mustang. 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 Ford Mustang use?
The EPA lists the 2021 Ford Mustang as running on regular gasoline. Using a different grade than the manufacturer specifies can affect fuel economy and engine longevity. -
Has the Ford Mustang become more fuel efficient over time?
Combined MPG has stayed close to flat across the run. Both the earliest (1984 Ford Mustang, 22 MPG) and most recent (2026 Ford Mustang, 26 MPG) versions sit in the same range. -
How much CO₂ does the 2021 Ford Mustang emit?
Tailpipe CO₂ emissions are 356 g/mi. Multiplied across a typical year of driving (15,000 miles) that works out to about 5,340 kilograms of CO₂. -
What is the difference between the city and highway MPG of the 2021 Ford Mustang?
City driving returns 21 MPG and highway driving returns 32 MPG, a gap of 11 MPG. A spread that wide is typical of cars with conventional automatic or manual transmissions, where stop-start city traffic eats more fuel than a steady highway cruise. -
What engine is in the 2021 Ford Mustang?
The 2021 Ford Mustang has a 2.3-liter 4-cylinder turbocharged engine (EPA description: SIDI). Smaller turbocharged engines like this one tend to deliver bigger-engine power on demand while keeping fuel economy closer to a non-turbo version of the same displacement. -
What transmission and drivetrain does the 2021 Ford Mustang have?
The 2021 Ford Mustang comes with a automatic (s10) transmission and rear-wheel drive. -
How does the 2021 Ford Mustang compare to the best car in its class?
The most efficient car in the Subcompact Cars class for the 2021 model year is the BMW i3 at 113 combined MPG. The Ford Mustang returns 25 MPG, a gap of 88 MPG. If you are comparing on fuel economy alone, the class leader is worth a look.
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.