2020 Audi A8 Gas Tank Size & Fuel Capacity
Fuel tank capacity
17.2–21.7gal · 65–82 L
The 2020 Audi A8 has a fuel tank capacity of 17.2 to 21.7 gallons (65–82 liters), depending on the trim. The most common size is 21.7 gallons, used on 2 trims.
A full tank is good for roughly 464–564 highway miles or 326–369 miles around town, going by the EPA ratings.
21.7 gal · Bigger than 76% of 2020 models we list.
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2020 Audi A8 fuel tank capacity by trim
What changes the tank sizeTap an option to filter the table
- Powertrain
- Engine
All 3 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| L 4dr Sedan AWD w/60 TFSI e 3.0L 6cyl Turbo 8A · AWD Plug-in hybrid MPG 21 / 27Range 361 / 464 mi | 3.0L 6cyl Turbo 8A Plug-in hybrid | AWD | 17.2 gal65 L | 21 / 27 | 361 / 464 mi | |
| L 4dr Sedan AWD w/55 TFSI 3.0L 6cyl Turbo mild hybrid 8A · AWD MPG 17 / 26Range 369 / 564 mi | 3.0L 6cyl Turbo mild hybrid 8A | AWD | 21.7 gal82 L | 17 / 26 | 369 / 564 mi | |
| L 4dr Sedan AWD w/60 TFSI 4.0L 8cyl Turbo mild hybrid 8A · AWD MPG 15 / 23Range 326 / 499 mi | 4.0L 8cyl Turbo mild hybrid 8A | AWD | 21.7 gal82 L | 15 / 23 | 326 / 499 mi | |
| No trim matches all of these filters. | ||||||
Tank figures are the manufacturer's rated capacity, sorted smallest tank first. Range is tank size times EPA city or highway MPG.
How far a 2020 Audi A8 goes on a tank
Gallons left and the distance they cover at each mark on the fuel gauge, at EPA city and highway mileage. At the combined rating of 21 MPG, a full 21.7-gallon tank covers about 456 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 21.7 | 564 | 369 |
| 3/4 | 16.3 | 423 | 277 |
| 1/2 | 10.9 | 282 | 184 |
| 1/4 | 5.4 | 141 | 92 |
| 1/8 | 2.7 | 71 | 46 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 714 gallons, roughly 33 full tanks.
Fuel gauges aren't perfectly linear and the low-fuel light comes on with a few gallons still in the tank, so plan your stop before the last eighth.
- EPA combined
- 23 MPG
- Tailpipe CO2
- 213 g/mi
- EPA greenhouse score
- 9 of 10
- Source
- EPA ratings
What it costs to fill up a 2020 Audi A8
$114.58 to fill the 21.7-gallon tank from empty with premium, at this week's US average of $5.28 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 17.2 gal | Premium | $5.28 | $90.82 | $68.11 |
| 21.7 gal | Premium | $5.28 | $114.58 | $85.93 |
By region, 21.7-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $106.98 |
| Midwest | $5.37 | $116.53 |
| Gulf CoastLowest | $4.57 | $99.17 |
| Rocky Mountain | $5.12 | $111.10 |
| West Coast | $6.08 | $131.94 |
| CaliforniaHighest | $6.36 | $138.01 |
Prices: U.S. Energy Information Administration retail averages for the week of October 26, 2026. This week's prices by state and city.
Your own price
- 17.2-gallon tank$90.82
- 21.7-gallon tank$114.58
- A year of driving (15,000 mi)$3,771
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
A8 tank size in other years
The tank changed for 2020: 17.2–21.7 gal, down from 21.7 gal on the 2019 A8.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2025 A8 | 21.7 gal | 564 mi |
| 2024 A8 | 21.7 gal | 608 mi |
| 2023 A8 | 21.7 gal | 608 mi |
| 2022 A8 | 21.7 gal | 608 mi |
| 2021 A8 | 17.2–21.7 gal | 564 mi |
| 2020 A8 | 17.2–21.7 gal | 564 mi |
| 2019 A8 | 21.7 gal | 586 mi |
| 2018 A8 | 21.7 gal | 629 mi |
| 2017 A8 | 21.7 gal | 629 mi |
| 2016 A8 | 23.8 gal | 857 mi |
| 2015 A8 | 23.8 gal | 857 mi |
- 2027
- 2026
- 2025
- 2024
- 2023
- 2022
- 2021
- 2020
- 2019
- 2018
- 2017
- 2016
- 2015
- 2014
- 2013
- 2012
- 2011
- 2010
- 2009
- 2008
- 2007
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- 2005
- 2004
- 2003
- 2002
- 2001
- 2000
- 1999
- 1998
- 1997
2020 Audi A8 vs similar 2020 sedans
At 21.7 gallons, the A8's largest tank ranks third of the six 2020 sedans compared here. The Mercedes-Benz S-Class carries the most (24.3 gal) and the Lincoln Continental the least (18.0 gal).
| 2020 model | Tank | Longest highway range |
|---|---|---|
| Mercedes-Benz S-Class | 21.1–24.3 gal | 591 mi |
| Porsche Panamera | 21.1–23.7 gal | 640 mi |
| Audi A8 | 17.2–21.7 gal | 564 mi |
| BMW ALPINA B7 | 20.6 gal | 515 mi |
| Cadillac CT6-V | 19.2 gal | 480 mi |
| Lincoln Continental | 18.0 gal | 486 mi |
Other 2020 sedans of a similar size, one model per brand.
2020 Audi A8 fuel system recalls
None of the 5 recalls NHTSA lists for the 2020 Audi A8 involve the fuel system.
Frequently asked questions
What is the fuel tank capacity of the 2020 Audi A8?
The 2020 Audi A8 holds between 17.2 and 21.7 gallons, depending on the trim. 21.7 gallons is the usual size; the smaller 17.2-gallon tank is on the L 4dr Sedan AWD w/60 TFSI e.
How many gallons and liters does the 2020 Audi A8 gas tank hold?
The 2020 Audi A8 tank holds 65–82 liters, or 17.2–21.7 gallons in US gallons.
Which 2020 Audi A8 has the biggest gas tank?
The 21.7-gallon tank is on the L 4dr Sedan AWD w/55 TFSI, L 4dr Sedan AWD w/60 TFSI. The smallest tank, 17.2 gallons, is on the L 4dr Sedan AWD w/60 TFSI e.
Does the 2020 Audi A8 tank change with the powertrain?
Yes. Plug-in hybrid: 17.2 gal; Gas: 21.7 gal.
How far can a 2020 Audi A8 go on a full tank?
About 464–564 miles on the highway and 326–369 miles in town, going from full to empty at its EPA ratings. Expect less in practice, since nobody runs the tank dry.
How many miles can a 2020 Audi A8 go on a quarter tank?
About 141 highway miles or 92 in town from the 21.7-gallon tank, which has roughly 5.4 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2020 Audi A8 take?
Premium unleaded (required). The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2020 Audi A8?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 21.7-gallon tank from empty costs $114.58. It ranges from $99.17 in the Gulf Coast to $138.01 in California.
How much does a full tank of gas weigh in a 2020 Audi A8?
About 135 pounds for the 21.7-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2020 Audi A8 have a bigger gas tank than the BMW ALPINA B7?
Yes. The 2020 Audi A8 holds up to 21.7 gallons; the 2020 BMW ALPINA B7 holds up to 20.6.
Has the 2020 Audi A8 had a fuel pump or fuel system recall?
No. None of the 5 recalls NHTSA lists for the 2020 Audi A8 involve the fuel system.
Sources
- Tank sizes: manufacturer-rated capacities from US-market specifications, checked against independent references. Updated October 2026.
- MPG and range: EPA ratings (fueleconomy.gov). Range is tank size times EPA MPG.
- Fuel prices: U.S. Energy Information Administration, week of October 26, 2026 (this week's prices).
- Recalls: NHTSA recall database (Audi fuel system recalls).
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.