2021 Audi A5 quattro: MPG and fuel economy

This page collects every fuel-economy figure the EPA publishes for the 2021 Audi A5 quattro. 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 Audi A5 quattro. 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 Audi A5 quattro compares

The 2021 Audi A5 quattro returns 27 combined MPG. Cars in the Subcompact Cars class for the same model year average 26.5 MPG, which puts this car ahead of the class average by about 2%.

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 Audi A5 quattro 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.

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 premium gasoline, which is $4.61/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 555.6 gallons (the car's annual consumption at the rated MPG).

Year-over-year MPG for the Audi A5 quattro

The EPA has rated the Audi A5 quattro across 16 model years, from 2008 Audi A5 quattro through 2026 Audi A5 quattro. 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.

The 2008 Audi A5 quattro returned 21 MPG. The most recent 2026 Audi A5 quattro returns 26 MPG. That is an improvement of 5 MPG over 18 model years, the kind of gain that usually comes from smaller engines, hybrid systems, or aerodynamic redesigns.

Compare against other Subcompact Cars for 2021

If you are cross-shopping the 2021 Audi A5 quattro, 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, 86 MPG ahead of the 2021 Audi A5 quattro.

Specifications

The 2021 Audi A5 quattro runs a 2-liter 4-cylinder turbocharged engine paired with a automatic (am-s7), sending power through all-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

2L 4-cylinder turbocharged

Transmission

Automatic (AM-S7)

Drivetrain

All-Wheel Drive

Fuel type

Premium

Annual petroleum use

11 barrels per year

Start-stop system

Yes

Common questions about the 2021 Audi A5 quattro

Quick answers to the questions people most often search for when looking up the 2021 Audi A5 quattro.

• Is the 2021 Audi A5 quattro fuel efficient?

  It is in line with the rest of the class. The 2021 Audi A5 quattro returns 27 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 Audi A5 quattro get?

  The EPA rates the 2021 Audi A5 quattro at 27 combined MPG, 24 MPG in city driving, and 31 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 Audi A5 quattro per year?

  The EPA estimates an annual fuel cost of $2,550 for the 2021 Audi A5 quattro. 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.
• Does the 2021 Audi A5 quattro require premium gas?

  Yes. The EPA lists the 2021 Audi A5 quattro as requiring premium gasoline. Running it on regular can reduce performance and may affect engine warranties, so it is not a recommended way to save at the pump.
• Has the Audi A5 quattro become more fuel efficient over time?

  Yes. The first EPA-rated Audi A5 quattro, the 2008 Audi A5 quattro, returned 21 combined MPG. The most recent 2026 Audi A5 quattro returns 26 MPG, an improvement of 5 MPG over the run.
• How much CO₂ does the 2021 Audi A5 quattro emit?

  Tailpipe CO₂ emissions are 331 g/mi. Multiplied across a typical year of driving (15,000 miles) that works out to about 4,965 kilograms of CO₂.
• What is the difference between the city and highway MPG of the 2021 Audi A5 quattro?

  City driving returns 24 MPG and highway driving returns 31 MPG, a gap of 7 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 Audi A5 quattro?

  The 2021 Audi A5 quattro has a 2-liter 4-cylinder turbocharged engine (EPA description: SIDI; Mild Hybrid). 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 Audi A5 quattro have?

  The 2021 Audi A5 quattro comes with a automatic (am-s7) transmission and all-wheel drive. All-wheel-drive variants typically read 1 to 3 MPG lower than the front-wheel-drive equivalent of the same engine, since the extra hardware adds weight and parasitic loss.
• How does the 2021 Audi A5 quattro 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 Audi A5 quattro returns 27 MPG, a gap of 86 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.