SLT 4dr SUV 4WD5.3L 8cyl 10A · 4WD · RegularMPG 15 / 19Range 420 / 532 mi
5.3L 8cyl 10A
4WD
28.0 gal106 L
Regular
15 / 19
420 / 532 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 2021 GMC Yukon XL 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 17 MPG, a full 28.0-gallon tank covers about 476 miles.
Gauge
Gallons
Highway miles
City miles
Full
28.0
532
420
3/4
21.0
399
315
1/2
14.0
266
210
1/4
7.0
133
105
1/8
3.5
67
53
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 882 gallons, roughly 32 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 2021 SUVs of a similar size, one model per brand.
2021 GMC Yukon XL fuel system recalls
NHTSA lists 1 fuel-system recall for the 2021 GMC Yukon XL, out of 12 recalls in total. A recall applies only to the vehicles named in it, so check your VIN.
General Motors, LLC (GM) is recalling certain 2021 Cadillac Escalade, Escalade ESV, Chevrolet Suburban, Tahoe, GMC Yukon, and Yukon XL vehicles. The fuel pump power control module may cause the fuel pump to fail or operate intermittently, which can interrupt fuel flow to the engine, and cause an unexpected engine stall.
Risk and remedy
Risk: An engine stall increases the risk of a crash.
Remedy: Dealers will replace the fuel pump power control module, free of charge. Owner notification letters were mailed on October 14, 2021. Owners may contact Chevrolet customer service at 1-800-222-1020; Cadillac customer service at 1-800-458-8006; or GMC customer service at 1-800-462-8782. GM's number for this recall is N212332040.
What is the fuel tank capacity of the 2021 GMC Yukon XL?
The 2021 GMC Yukon XL holds 28.0 gallons (106 liters) on every trim we list.
How many gallons and liters does the 2021 GMC Yukon XL gas tank hold?
The 2021 GMC Yukon XL tank holds 106 liters, or 28.0 gallons in US gallons.
Does 4WD change the 2021 GMC Yukon XL gas tank?
No. 4WD and RWD versions of the 2021 GMC Yukon XL use the same 28.0 gal tank.
How far can a 2021 GMC Yukon XL go on a full tank?
About 532–560 miles on the highway and 392–448 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 2021 GMC Yukon XL go on a quarter tank?
About 133 highway miles or 105 in town from the 28.0-gallon tank, which has roughly 7.0 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2021 GMC Yukon XL take?
Regular unleaded, or Premium unleaded (recommended), depending on the engine. The label inside the fuel door confirms it for your car.
How much does it cost to fill up a 2021 GMC Yukon XL?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 28.0-gallon tank from empty costs $119.56. It ranges from $103.60 in the Gulf Coast to $164.92 in California.
How much does a full tank of gas weigh in a 2021 GMC Yukon XL?
About 174 pounds for the 28.0-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2021 GMC Yukon XL have a bigger gas tank than the Chevrolet Suburban?
No, they match: both top out at 28.0 gallons in 2021.
Has the 2021 GMC Yukon XL had a fuel pump or fuel system recall?
Yes. NHTSA lists 1 fuel-system recall for the 2021 GMC Yukon XL: 21V739000 (delivery · fuel pump · control/drive module). 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).