The 2000 Audi A6 has a fuel tank capacity of 18.5 to 21.7 gallons (70–82 liters), depending on the trim. The most common size is 18.5 gallons, used on 4 trims.
A full tank is good for roughly 407–477 highway miles or 278–326 miles around town, going by the EPA ratings.
020 gal40 gal
21.7 gal · Bigger than 74% of 2000 models we list.
2.8 Avant quattro 4dr Wagon AWD2.8L 6cyl 5A · AWDMPG 15 / 22Range 278 / 407 mi
2.8L 6cyl 5A
AWD
18.5 gal70 L
15 / 22
278 / 407 mi
2.8 quattro 4dr Sedan AWD2.8L 6cyl · AWDMPG 15 / 22Range 278 / 407 mi
2.8L 6cyl
AWD
18.5 gal70 L
15 / 22
278 / 407 mi
4.2 quattro 4dr Sedan AWD4.2L 8cyl 5A · AWDMPG 15 / 22Range 326 / 477 mi
4.2L 8cyl 5A
AWD
21.7 gal82 L
15 / 22
326 / 477 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 2000 Audi A6 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 18 MPG, a full 18.5-gallon tank covers about 333 miles.
Gauge
Gallons
Highway miles
City miles
Full
18.5
407
278
3/4
13.9
305
208
1/2
9.3
204
139
1/4
4.6
102
69
1/8
2.3
51
35
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 833 gallons, roughly 45 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 2000 sedans of a similar size, one model per brand.
2000 Audi A6 fuel system recalls
NHTSA lists 1 fuel-system recall for the 2000 Audi A6, out of 4 recalls in total. A recall applies only to the vehicles named in it, so check your VIN.
Storage · Tank assemblyMay 3, 2001 · NHTSA 01V157000 · Volkswagen Of America,Inc · 70,000 vehicles
Vehicle description: passenger vehicles. Sulfur in fuel interacts with certain additives found in widely available gasoline causing sulfur to become deposited on the contact points of three fuel sending units mounted inside the fuel tank. This could cause the fuel gauge to read full while the fuel tank may not in fact be full or could be empty.
Risk and remedy
Risk: Running out of fuel without warning while the fuel gauge indicates that there is sufficient fuel in the tank lead to safety problems.
Remedy: Dealers will remove the existing fuel level sending units and replace them with fuel level sending units using a new alloy composed of gold, silver, and a small amount of nickel, which will not chemically react with sulfur. Vw/audi will also call back vehicles that were repaired under a previous recall last june in order to install the updated fuel sending units NHTSA 00v137/audi lb). Owner notification began may 1, 2001. Owners who take their vehicles to an authorized dealer on an agreed upon service date and do not receive the free remedy within a reasonable time should contact audi at 1-866-892-2834.
What is the fuel tank capacity of the 2000 Audi A6?
The 2000 Audi A6 holds between 18.5 and 21.7 gallons, depending on the trim. 18.5 gallons is the usual size; the 21.7-gallon tank comes on the 4.2 quattro 4dr Sedan AWD (4.2L 8cyl 5A).
How many gallons and liters does the 2000 Audi A6 gas tank hold?
The 2000 Audi A6 tank holds 70–82 liters, or 18.5–21.7 gallons in US gallons.
Which 2000 Audi A6 has the biggest gas tank?
The 21.7-gallon tank is on the 4.2 quattro 4dr Sedan AWD. The smallest tank, 18.5 gallons, is on the 2.7T quattro 4dr Sedan AWD.
Does AWD change the 2000 Audi A6 gas tank?
Yes. AWD: 18.5–21.7 gal; FWD: 18.5 gal.
How far can a 2000 Audi A6 go on a full tank?
About 407–477 miles on the highway and 278–326 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 2000 Audi A6 go on a quarter tank?
About 102 highway miles or 69 in town from the 18.5-gallon tank, which has roughly 4.6 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2000 Audi A6 take?
Regular unleaded. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2000 Audi A6?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 18.5-gallon tank from empty costs $78.99. It ranges from $68.45 in the Gulf Coast to $108.96 in California.
How much does a full tank of gas weigh in a 2000 Audi A6?
About 135 pounds for the 21.7-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2000 Audi A6 have a bigger gas tank than the Cadillac Catera?
Yes. The 2000 Audi A6 holds up to 21.7 gallons; the 2000 Cadillac Catera holds up to 16.0.
Has the 2000 Audi A6 had a fuel pump or fuel system recall?
Yes. NHTSA lists 1 fuel-system recall for the 2000 Audi A6: 01V157000 (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).