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1999 Audi A6 Gas Tank Size & Fuel Capacity

Sedan 3 trims listed 2 fuel-system recalls ← 1998 2000 →

Fuel tank capacity

18.5gal · 70 L

The 1999 Audi A6 has a fuel tank capacity of 18.5 gallons (70 liters) on every trim.

A full tank is good for roughly 444–463 highway miles or 278–296 miles around town, going by the EPA ratings.

18.5 gal · Smaller than 53% of 1999 models we list.

Highway range
444–463 mi
City range
278–296 mi
Fuel
Regular unleaded
EPA combined
18–19 MPG
EPA size class
Midsize Cars

1999 Audi A6 fuel tank capacity by trim

What changes the tank sizeTap an option to filter the table

Drive
no difference

All 3 trims

MPG and range are city / highway.

TrimEngineDrive Tank MPG city / hwy Range city / hwy
2.8 4dr Sedan 2.8L 6cyl 5A · FWD MPG 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 AWD 2.8L 6cyl 5A · AWD MPG 15 / 24Range 278 / 444 mi 2.8L 6cyl 5A AWD 18.5 gal70 L 15 / 24 278 / 444 mi
2.8 quattro 4dr Sedan AWD 2.8L 6cyl 5A · AWD MPG 15 / 24Range 278 / 444 mi 2.8L 6cyl 5A AWD 18.5 gal70 L 15 / 24 278 / 444 mi

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 1999 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.

GaugeGallonsHighway milesCity miles
Full18.5444278
3/413.9333208
1/29.3222139
1/44.611169
1/82.35635

Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 833 gallons, roughly 45 full tanks.

In real driving: owners who log fill-ups at fueleconomy.gov average 19.9 MPG in the A6 (9 drivers), about 368 miles on a full 18.5-gallon tank.

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
18–19 MPG
Tailpipe CO2
468–494 g/mi
Source
EPA ratings

What it costs to fill up a 1999 Audi A6

$78.99 to fill the 18.5-gallon tank from empty with regular, at this week's US average of $4.27 a gallon.

TankFuelUS avg / galFrom emptyFrom 1/4 tank
18.5 galRegular$4.27$78.99$59.25

By region, 18.5-gallon tank

RegionRegular / galFill from empty
East Coast$4.02$74.37
Midwest$4.27$78.99
Gulf CoastLowest$3.70$68.45
Rocky Mountain$4.46$82.51
West Coast$5.42$100.27
CaliforniaHighest$5.89$108.96

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

  • 18.5-gallon tank$78.99
  • A year of driving (15,000 mi)$3,558

Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.

A6 tank size in other years

The 1999 A6 uses the same 18.5 gal tank as the 1998 model.

Model yearTankLongest highway range
2004 A6 18.5–21.7 gal 477 mi
2003 A6 18.5–21.7 gal 499 mi
2002 A6 18.5–21.7 gal 499 mi
2001 A6 18.5–21.7 gal 499 mi
2000 A6 18.5–21.7 gal 477 mi
1999 A6 18.5 gal 463 mi
1998 A6 18.5 gal 463 mi
1997 A6 19.8–21.1 gal 485 mi
1996 A6 19.8–21.1 gal 485 mi
1995 A6 21.1 gal 485 mi
Audi A6 fuel tank by model yearSmallest tank Larger tank options
19951996199719981999200020012002200320042005200620072008200920102011201220132014201520162017201820192020202120222023202420252026
← 1998 Audi A6 Every A6 year 2000 Audi A6 →

1999 Audi A6 vs similar 1999 sedans

At 18.5 gallons, the A6's largest tank ranks fourth of the seven 1999 sedans compared here. The Mercedes-Benz E55 AMG® carries the most (21.1 gal) and the Cadillac Catera the least (16.0 gal).

1999 modelTankLongest highway range
Mercedes-Benz E55 AMG® 21.1 gal 443 mi
Lexus GS 300 19.8 gal 455 mi
Saab 9-5 19.8 gal 554 mi
Audi A6 18.5 gal 463 mi
Volvo S70 17.9 gal 465 mi
Acura TL 17.2 gal 430 mi
Cadillac Catera 16.0 gal 368 mi

Other 1999 sedans of a similar size, one model per brand.

1999 Audi A6 fuel system recalls

NHTSA lists 2 fuel-system recalls for the 1999 Audi A6, out of 9 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.

All Audi fuel recalls Look up your tank by VIN

Frequently asked questions

What is the fuel tank capacity of the 1999 Audi A6?

The 1999 Audi A6 holds 18.5 gallons (70 liters) on every trim we list.

How many gallons and liters does the 1999 Audi A6 gas tank hold?

The 1999 Audi A6 tank holds 70 liters, or 18.5 gallons in US gallons.

Does AWD change the 1999 Audi A6 gas tank?

No. AWD and FWD versions of the 1999 Audi A6 use the same 18.5 gal tank.

How far can a 1999 Audi A6 go on a full tank?

About 444–463 miles on the highway and 278–296 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 1999 Audi A6 go on a quarter tank?

About 111 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.

How many miles does a 1999 Audi A6 really get on a tank?

Drivers who log their fill-ups at fueleconomy.gov average 19.9 MPG in the 1999 Audi A6 (9 drivers), which works out to about 368 miles on a full 18.5-gallon tank.

What gas does the 1999 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 1999 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 1999 Audi A6?

About 115 pounds for the 18.5-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.

Does the 1999 Audi A6 have a bigger gas tank than the Acura TL?

Yes. The 1999 Audi A6 holds up to 18.5 gallons; the 1999 Acura TL holds up to 17.2.

Has the 1999 Audi A6 had a fuel pump or fuel system recall?

Yes. NHTSA lists 2 fuel-system recalls for the 1999 Audi A6: 01V157000 (storage · tank assembly); 99V058000 (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).
  • Recalls: NHTSA recall database (Audi fuel system recalls).
  • Real-world MPG: driver-reported fill-ups shared at fueleconomy.gov (My MPG).

Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.

Other 1999 Audi models

A415.6–16.4 gallons A823.7 gallons