Avant quattro AWD 4dr Wagon4.2L 8cyl 5A · AWDMPG 13 / 19Range 282 / 412 mi
4.2L 8cyl 5A
AWD
21.7 gal82 L
13 / 19
282 / 412 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 2003 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 15 MPG, a full 21.7-gallon tank covers about 326 miles.
Gauge
Gallons
Highway miles
City miles
Full
21.7
412
282
3/4
16.3
309
212
1/2
10.9
206
141
1/4
5.4
103
71
1/8
2.7
52
35
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 1,000 gallons, roughly 46 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.
Other 2003 sedans of a similar size, one model per brand.
2003 Audi S6 fuel system recalls
NHTSA lists 1 fuel-system recall for the 2003 Audi S6, out of 2 recalls in total. A recall applies only to the vehicles named in it, so check your VIN.
Storage · Tank assemblyMay 3, 2011 · NHTSA 11V267000 · Volkswagen Of America, Inc · 5,992 vehicles
Volkswagen is recalling certain model year 2001-2004 audi a6, model year 2002-2003 s6 and model year 2003 rs6 vehicles equipped with 4.2l engines and manufactured from june 19, 2001, through june 8, 2004. The aging of the plastic material in the fuel tank rollover valve combined with bending stress from the aluminum ventilation line to the rollover valve nipple may lead to cracking of the nipple. If this happens, a fuel leak may result.
Risk and remedy
Risk: A fuel leak in the presence of an ignition source could lead to a vehicle fire.
Remedy: Dealers will reinforce the nipple on the rollover valve to prevent leakage or repair the cracking at the nipple. The recall is expected to begin during june 2011. Owners may contact audi at 1-800-822-2834.
What is the fuel tank capacity of the 2003 Audi S6?
The 2003 Audi S6 holds 21.7 gallons (82 liters).
How many gallons and liters does the 2003 Audi S6 gas tank hold?
The 2003 Audi S6 tank holds 82 liters, or 21.7 gallons in US gallons.
How far can a 2003 Audi S6 go on a full tank?
About 412 miles on the highway and 282 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 2003 Audi S6 go on a quarter tank?
About 103 highway miles or 71 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 2003 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 2003 Audi S6?
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 2003 Audi S6?
About 135 pounds for the 21.7-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2003 Audi S6 have a bigger gas tank than the Volvo XC70?
Yes. The 2003 Audi S6 holds up to 21.7 gallons; the 2003 Volvo XC70 holds up to 18.5.
Has the 2003 Audi S6 had a fuel pump or fuel system recall?
Yes. NHTSA lists 1 fuel-system recall for the 2003 Audi S6: 11V267000 (storage · tank assembly). Check your VIN at nhtsa.gov/recalls to see if your car is affected.
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).