2008 Audi S6 Gas Tank Size & Fuel Capacity
Fuel tank capacity
21.1gal · 80 L
The 2008 Audi S6 has a fuel tank capacity of 21.1 gallons (80 liters).
A full tank is good for roughly 401 highway miles or 295 miles around town, going by the EPA ratings.
21.1 gal · Bigger than 63% of 2008 models we list.
- By trim
- Gas cap & parts
- Fuel essentials
- Miles per tank
- Fill-up cost
- Other years
- Compared
- Fuel recalls
- Pump & gauge parts
- FAQ
2008 Audi S6 fuel tank capacity by trim
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | MPG city / hwy | Range city / hwy | |
|---|---|---|---|---|---|---|
| quattro 4dr Sedan AWD 5.2L 10cyl 6A · AWD MPG 14 / 19Range 295 / 401 mi | 5.2L 10cyl 6A | AWD | 21.1 gal80 L | 14 / 19 | 295 / 401 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 2008 Audi S6 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 16 MPG, a full 21.1-gallon tank covers about 338 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 21.1 | 401 | 295 |
| 3/4 | 15.8 | 301 | 222 |
| 1/2 | 10.6 | 200 | 148 |
| 1/4 | 5.3 | 100 | 74 |
| 1/8 | 2.6 | 50 | 37 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 938 gallons, roughly 44 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
- 16 MPG
- Tailpipe CO2
- 555 g/mi
- Gas guzzler tax
- Yes
- Source
- EPA ratings
What it costs to fill up a 2008 Audi S6
$111.41 to fill the 21.1-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 |
|---|---|---|---|---|
| 21.1 gal | Premium | $5.28 | $111.41 | $83.56 |
By region, 21.1-gallon tank
| Region | Premium / gal | Fill from empty |
|---|---|---|
| East Coast | $4.93 | $104.02 |
| Midwest | $5.37 | $113.31 |
| Gulf CoastLowest | $4.57 | $96.43 |
| Rocky Mountain | $5.12 | $108.03 |
| West Coast | $6.08 | $128.29 |
| CaliforniaHighest | $6.36 | $134.20 |
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
- 21.1-gallon tank$111.41
- A year of driving (15,000 mi)$4,950
Starts at the US average for premium; type in what your station charges. For other tank sizes, use the fill-up calculator.
S6 tank size in other years
The 2008 S6 uses the same 21.1 gal tank as the 2007 model.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2014 S6 | 19.8 gal | 535 mi |
| 2013 S6 | 19.8 gal | 535 mi |
| 2011 S6 | 21.1 gal | 443 mi |
| 2010 S6 | 21.1 gal | 401 mi |
| 2009 S6 | 21.1 gal | 401 mi |
| 2008 S6 | 21.1 gal | 401 mi |
| 2007 S6 | 21.1 gal | 401 mi |
| 2003 S6 | 21.7 gal | 412 mi |
| 2002 S6 | 21.7 gal | 412 mi |
| 1995 S6 | 21.1 gal | 464 mi |
2008 Audi S6 vs similar 2008 sedans
At 21.1 gallons, the S6's largest tank ranks third of the seven 2008 sedans compared here. The BMW ALPINA B7 carries the most (23.3 gal) and the Cadillac STS-V the least (17.0 gal).
| 2008 model | Tank | Longest highway range |
|---|---|---|
| BMW ALPINA B7 | 23.3 gal | 489 mi |
| Lexus LS 460 | 22.2 gal | 533 mi |
| Audi S6 | 21.1 gal | 401 mi |
| Acura RL | 19.4 gal | 466 mi |
| Volvo S80 | 18.5 gal | 444 mi |
| Jaguar S-Type | 18.4 gal | 478 mi |
| Cadillac STS-V | 17.0 gal | 323 mi |
Other 2008 sedans of a similar size, one model per brand.
2008 Audi S6 fuel system recalls
None of the 2 recalls NHTSA lists for the 2008 Audi S6 involve the fuel system.
2008 Audi S6 fuel pump and gauge parts
NHTSA lists no fuel-system recall for the 2008 Audi S6, so a failed pump or gauge is a normal repair. These are the part numbers the makers list for it.
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Frequently asked questions
What is the fuel tank capacity of the 2008 Audi S6?
The 2008 Audi S6 holds 21.1 gallons (80 liters).
How many gallons and liters does the 2008 Audi S6 gas tank hold?
The 2008 Audi S6 tank holds 80 liters, or 21.1 gallons in US gallons.
How far can a 2008 Audi S6 go on a full tank?
About 401 miles on the highway and 295 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 2008 Audi S6 go on a quarter tank?
About 100 highway miles or 74 in town from the 21.1-gallon tank, which has roughly 5.3 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2008 Audi S6 take?
Premium unleaded (required). The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2008 Audi S6?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 21.1-gallon tank from empty costs $111.41. It ranges from $96.43 in the Gulf Coast to $134.20 in California.
How much does a full tank of gas weigh in a 2008 Audi S6?
About 131 pounds for the 21.1-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2008 Audi S6 have a bigger gas tank than the BMW ALPINA B7?
No. The 2008 BMW ALPINA B7 holds up to 23.3 gallons; the 2008 Audi S6 holds up to 21.1.
Has the 2008 Audi S6 had a fuel pump or fuel system recall?
No. None of the 2 recalls NHTSA lists for the 2008 Audi S6 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.