2.8 Avant 4dr Wagon2.8L 6cyl 5A · FWDMPG 16 / 25Range 296 / 463 mi
2.8L 6cyl 5A
FWD
18.5 gal70 L
16 / 25
296 / 463 mi
2.8 Avant quattro 4dr Wagon AWD2.8L 6cyl 5A · AWDMPG 17 / 22Range 315 / 407 mi
2.8L 6cyl 5A
AWD
18.5 gal70 L
17 / 22
315 / 407 mi
2.8 quattro 4dr Sedan AWD2.8L 6cyl 5A · AWDMPG 15 / 24Range 278 / 444 mi
2.8L 6cyl 5A
AWD
18.5 gal70 L
15 / 24
278 / 444 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 (worked out from the rated MPG where the EPA range wasn't published).
How far a 1998 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 19 MPG, a full 18.5-gallon tank covers about 352 miles.
Gauge
Gallons
Highway miles
City miles
Full
18.5
463
296
3/4
13.9
347
222
1/2
9.3
231
148
1/4
4.6
116
74
1/8
2.3
58
37
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 789 gallons, roughly 43 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.
At 18.5 gallons, the A6's largest tank ranks fourth of the six 1998 sedans compared here. The INFINITI Q45 carries the most (21.4 gal) and the Cadillac Catera the least (18.0 gal).
Other 1998 sedans of a similar size, one model per brand.
1998 Audi A6 fuel system recalls
NHTSA lists 3 fuel-system recalls for the 1998 Audi A6, out of 10 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.
Storage · Tank assembly · Filler pipe and capMar 22, 1999 · NHTSA 99V058000 · Volkswagen Of America,Inc · 27,964 vehicles
Vehicle description: passenger vehicles equipped with quattro drive system which employs a fuel and fuel vapor leak detection system. If the vehicle is refueled shortly after the engine is started, and is kept running while being refueled, the fuel vapor recovery system could produce sufficient back pressure to cause fuel to be ejected after a complete fill-up when the fuel pump nozzle is removed from the filler neck.
Risk and remedy
Risk: In the presence of an ignition source, fuel spray could result in fire or possible personal injury.
Remedy: Vw is providing a new page for the owner's manual and also requesting owners to make an appointment with their dealers to have a label containing important refueling instructions installed inside of the fuel filler door. Dealers will also remove the tire pressure label and replace it with a new label affixed to the fender well at the right rear door.
Storage · Tank assembly · Filler pipe and capSep 19, 1997 · NHTSA 97V160000 · Volkswagen Of America,Inc · 31 vehicles
Vehicle description: passenger vehicles. During pre-assembly of the fuel tanks, an incorrect filler neck was installed causing the filler neck to not "match" the fuel cap.
Risk and remedy
Risk: This condition could allow fuel to escape and if an ignition source was present, a fire could occur.
What is the fuel tank capacity of the 1998 Audi A6?
The 1998 Audi A6 holds 18.5 gallons (70 liters) on every trim we list.
How many gallons and liters does the 1998 Audi A6 gas tank hold?
The 1998 Audi A6 tank holds 70 liters, or 18.5 gallons in US gallons.
Does AWD change the 1998 Audi A6 gas tank?
No. FWD and AWD versions of the 1998 Audi A6 use the same 18.5 gal tank.
How far can a 1998 Audi A6 go on a full tank?
About 407–463 miles on the highway and 278–315 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 1998 Audi A6 go on a quarter tank?
About 116 highway miles or 74 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 1998 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 1998 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 1998 Audi A6?
About 115 pounds for the 18.5-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 1998 Audi A6 have a bigger gas tank than the Lexus GS 400?
No. The 1998 Lexus GS 400 holds up to 19.8 gallons; the 1998 Audi A6 holds up to 18.5.
Has the 1998 Audi A6 had a fuel pump or fuel system recall?
Yes. NHTSA lists 3 fuel-system recalls for the 1998 Audi A6: 01V157000 (storage · tank assembly); 99V058000 (storage · tank assembly · filler pipe and cap); 97V160000 (storage · tank assembly · filler pipe and cap). 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).