Premium Plus quattro 4dr Sedan AWD3.0L 6cyl S/C 8A · AWDMPG 20 / 29Range 396 / 574 mi
3.0L 6cyl S/C 8A
AWD
19.8 gal75 L
20 / 29
396 / 574 mi
Prestige quattro 4dr Sedan AWD3.0L 6cyl S/C 8A · AWDMPG 20 / 29Range 396 / 574 mi
3.0L 6cyl S/C 8A
AWD
19.8 gal75 L
20 / 29
396 / 574 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 2018 Audi A7 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 23 MPG, a full 19.8-gallon tank covers about 455 miles.
Gauge
Gallons
Highway miles
City miles
Full
19.8
574
396
3/4
14.9
431
297
1/2
9.9
287
198
1/4
5.0
144
99
1/8
2.5
72
50
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 652 gallons, roughly 33 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 19.8 gallons, the A7's largest tank ranks third of the seven 2018 sedans compared here. The BMW M5 carries the most (20.1 gal) and the Volvo S90 the least (15.9 gal).
Other 2018 sedans of a similar size, one model per brand.
2018 Audi A7 fuel system recalls
NHTSA lists 1 fuel-system recall for the 2018 Audi A7, out of 2 recalls in total. A recall applies only to the vehicles named in it, so check your VIN.
Fuel injection system · Fuel railJan 16, 2019 · NHTSA 19V035000 · Volkswagen Group Of America, Inc. · 74,881 vehicles
Volkswagen Group of America, Inc. (Audi) is recalling certain 2016-2018 Q7, A6 and A7 vehicles, and 2015-2018 Audi A8 vehicles. The left and right fuel rails may leak fuel.
Risk and remedy
Risk: A fuel leak in the presence of an ignition source can increase risk of a fire.
Remedy: Audi has notified owners, and dealers will replace the left and right fuel rail, free of charge. The recall began February 28, 2019. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 24DP.
What is the fuel tank capacity of the 2018 Audi A7?
The 2018 Audi A7 holds 19.8 gallons (75 liters) on every trim we list.
How many gallons and liters does the 2018 Audi A7 gas tank hold?
The 2018 Audi A7 tank holds 75 liters, or 19.8 gallons in US gallons.
How far can a 2018 Audi A7 go on a full tank?
About 574 miles on the highway and 396 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 2018 Audi A7 go on a quarter tank?
About 144 highway miles or 99 in town from the 19.8-gallon tank, which has roughly 5.0 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2018 Audi A7 take?
Premium unleaded (required). The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2018 Audi A7?
At the US average of $5.28 a gallon for premium (EIA, week of October 26, 2026), filling the 19.8-gallon tank from empty costs $104.54. It ranges from $90.49 in the Gulf Coast to $125.93 in California.
How much does a full tank of gas weigh in a 2018 Audi A7?
About 123 pounds for the 19.8-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2018 Audi A7 have a bigger gas tank than the BMW M5?
No. The 2018 BMW M5 holds up to 20.1 gallons; the 2018 Audi A7 holds up to 19.8.
Has the 2018 Audi A7 had a fuel pump or fuel system recall?
Yes. NHTSA lists 1 fuel-system recall for the 2018 Audi A7: 19V035000 (fuel injection system · fuel rail). 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).