2021 GMC Sierra 1500 Gas Tank Size and Capacity
Fuel tank capacity
24.0–28.0gal · 91–106 L
The 2021 GMC Sierra 1500 has a fuel tank capacity of 24.0 to 28.0 gallons (91–106 liters), depending on the trim. The most common size is 24.0 gallons, used on 25 trims.
A full tank is good for roughly 480–624 highway miles or 360–528 miles around town, going by the EPA ratings.
28.0 gal · Bigger than 93% of 2021 models we list.
Listed separately: 2021 GMC Sierra 2500HD (36.0 gal), 2021 GMC Sierra 3500HD (36.0 gal).
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2021 GMC Sierra 1500 fuel tank capacity by trim
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- Powertrain
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- no difference
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All 27 trims
MPG and range are city / highway.
| Trim | Engine | Drive | Tank | Fuel | MPG city / hwy | Range city / hwy |
|---|---|---|---|---|---|---|
| 4dr Crew Cab 4WD 5.8 ft. SB 4.3L 6cyl 6A · 4WD · Flex-fuel (gas or E85) MPG 15 / 20Range 360 / 480 mi | 4.3L 6cyl 6A Flex-fuel | 4WD | 24.0 gal91 L | Flex-fuelgas or E85 | 15 / 20 | 360 / 480 mi |
| 4dr Crew Cab 4WD 6.6 ft. SB 4.3L 6cyl 6A · 4WD · Flex-fuel (gas or E85) MPG 15 / 20Range 360 / 480 mi | 4.3L 6cyl 6A Flex-fuel | 4WD | 24.0 gal91 L | Flex-fuelgas or E85 | 15 / 20 | 360 / 480 mi |
| 4dr Crew Cab 5.8 ft. SB 4.3L 6cyl 6A · RWD · Flex-fuel (gas or E85) MPG 16 / 21Range 384 / 504 mi | 4.3L 6cyl 6A Flex-fuel | RWD | 24.0 gal91 L | Flex-fuelgas or E85 | 16 / 21 | 384 / 504 mi |
| 4dr Double Cab 4WD SB 4.3L 6cyl 6A · 4WD · Flex-fuel (gas or E85) MPG 15 / 20Range 360 / 480 mi | 4.3L 6cyl 6A Flex-fuel | 4WD | 24.0 gal91 L | Flex-fuelgas or E85 | 15 / 20 | 360 / 480 mi |
| 4dr Double Cab SB 4.3L 6cyl 6A · RWD · Flex-fuel (gas or E85) MPG 16 / 21Range 384 / 504 mi | 4.3L 6cyl 6A Flex-fuel | RWD | 24.0 gal91 L | Flex-fuelgas or E85 | 16 / 21 | 384 / 504 mi |
| AT4 4dr Crew Cab 4WD 5.8 ft. SB 5.3L 8cyl 10A · 4WD · Regular MPG 16 / 21Range 384 / 504 mi | 5.3L 8cyl 10A | 4WD | 24.0 gal91 L | Regular | 16 / 21 | 384 / 504 mi |
| AT4 4dr Crew Cab 4WD 6.6 ft. SB 3.0L 6cyl Turbodiesel 10A · 4WD · Diesel Diesel MPG 22 / 26Range 528 / 624 mi | 3.0L 6cyl Turbodiesel 10A Diesel | 4WD | 24.0 gal91 L | Diesel | 22 / 26 | 528 / 624 mi |
| Denali 4dr Crew Cab 4WD 5.8 ft. SB 5.3L 8cyl 10A · 4WD · Regular MPG 16 / 22Range 384 / 528 mi | 5.3L 8cyl 10A | 4WD | 24.0 gal91 L | Regular | 16 / 22 | 384 / 528 mi |
| Denali 4dr Crew Cab 4WD 6.6 ft. SB 5.3L 8cyl 10A · 4WD · Regular MPG 16 / 22Range 384 / 528 mi | 5.3L 8cyl 10A | 4WD | 24.0 gal91 L | Regular | 16 / 22 | 384 / 528 mi |
| Denali 4dr Crew Cab 5.8 ft. SB 5.3L 8cyl 8A · RWD · Regular MPG 17 / 23Range 408 / 552 mi | 5.3L 8cyl 8A | RWD | 24.0 gal91 L | Regular | 17 / 23 | 408 / 552 mi |
| Elevation 4dr Crew Cab 4WD 5.8 ft. SB 2.7L 4cyl Turbo 8A · 4WD · Regular MPG 18 / 21Range 432 / 504 mi | 2.7L 4cyl Turbo 8A | 4WD | 24.0 gal91 L | Regular | 18 / 21 | 432 / 504 mi |
| Elevation 4dr Crew Cab 4WD 5.8 ft. SB w/3VL 2.7L 4cyl Turbo 8A · 4WD · Regular MPG 18 / 21Range 432 / 504 mi | 2.7L 4cyl Turbo 8A | 4WD | 24.0 gal91 L | Regular | 18 / 21 | 432 / 504 mi |
| Elevation 4dr Crew Cab 4WD 6.6 ft. SB 2.7L 4cyl Turbo 8A · 4WD · Regular MPG 18 / 21Range 432 / 504 mi | 2.7L 4cyl Turbo 8A | 4WD | 24.0 gal91 L | Regular | 18 / 21 | 432 / 504 mi |
| Elevation 4dr Crew Cab 5.8 ft. SB 2.7L 4cyl Turbo 8A · RWD · Regular MPG 20 / 23Range 480 / 552 mi | 2.7L 4cyl Turbo 8A | RWD | 24.0 gal91 L | Regular | 20 / 23 | 480 / 552 mi |
| Elevation 4dr Double Cab 4WD SB 2.7L 4cyl Turbo 8A · 4WD · Regular MPG 18 / 21Range 432 / 504 mi | 2.7L 4cyl Turbo 8A | 4WD | 24.0 gal91 L | Regular | 18 / 21 | 432 / 504 mi |
| Elevation 4dr Double Cab 4WD SB w/3VL 2.7L 4cyl Turbo 8A · 4WD · Regular MPG 18 / 21Range 432 / 504 mi | 2.7L 4cyl Turbo 8A | 4WD | 24.0 gal91 L | Regular | 18 / 21 | 432 / 504 mi |
| Elevation 4dr Double Cab SB 2.7L 4cyl Turbo 8A · RWD · Regular MPG 20 / 23Range 480 / 552 mi | 2.7L 4cyl Turbo 8A | RWD | 24.0 gal91 L | Regular | 20 / 23 | 480 / 552 mi |
| SLE 4dr Crew Cab 4WD 5.8 ft. SB 2.7L 4cyl Turbo 8A · 4WD · Regular MPG 18 / 21Range 432 / 504 mi | 2.7L 4cyl Turbo 8A | 4WD | 24.0 gal91 L | Regular | 18 / 21 | 432 / 504 mi |
| SLE 4dr Crew Cab 4WD 6.6 ft. SB 2.7L 4cyl Turbo 8A · 4WD · Regular MPG 18 / 21Range 432 / 504 mi | 2.7L 4cyl Turbo 8A | 4WD | 24.0 gal91 L | Regular | 18 / 21 | 432 / 504 mi |
| SLE 4dr Crew Cab 5.8 ft. SB 2.7L 4cyl Turbo 8A · RWD · Regular MPG 20 / 23Range 480 / 552 mi | 2.7L 4cyl Turbo 8A | RWD | 24.0 gal91 L | Regular | 20 / 23 | 480 / 552 mi |
| SLE 4dr Double Cab 4WD SB 2.7L 4cyl Turbo 8A · 4WD · Regular MPG 18 / 21Range 432 / 504 mi | 2.7L 4cyl Turbo 8A | 4WD | 24.0 gal91 L | Regular | 18 / 21 | 432 / 504 mi |
| SLE 4dr Double Cab SB 2.7L 4cyl Turbo 8A · RWD · Regular MPG 20 / 23Range 480 / 552 mi | 2.7L 4cyl Turbo 8A | RWD | 24.0 gal91 L | Regular | 20 / 23 | 480 / 552 mi |
| SLT 4dr Crew Cab 4WD 5.8 ft. SB 5.3L 8cyl 10A · 4WD · Regular MPG 16 / 22Range 384 / 528 mi | 5.3L 8cyl 10A | 4WD | 24.0 gal91 L | Regular | 16 / 22 | 384 / 528 mi |
| SLT 4dr Crew Cab 4WD 6.6 ft. SB 5.3L 8cyl 10A · 4WD · Regular MPG 16 / 22Range 384 / 528 mi | 5.3L 8cyl 10A | 4WD | 24.0 gal91 L | Regular | 16 / 22 | 384 / 528 mi |
| SLT 4dr Crew Cab 5.8 ft. SB 5.3L 8cyl 8A · RWD · Regular MPG 17 / 23Range 408 / 552 mi | 5.3L 8cyl 8A | RWD | 24.0 gal91 L | Regular | 17 / 23 | 408 / 552 mi |
| 2dr Regular Cab 4WD LB 4.3L 6cyl 6A · 4WD · Flex-fuel (gas or E85) MPG 15 / 20Range 420 / 560 mi | 4.3L 6cyl 6A Flex-fuel | 4WD | 28.0 gal106 L | Flex-fuelgas or E85 | 15 / 20 | 420 / 560 mi |
| 2dr Regular Cab LB 4.3L 6cyl 6A · RWD · Flex-fuel (gas or E85) MPG 16 / 21Range 448 / 588 mi | 4.3L 6cyl 6A Flex-fuel | RWD | 28.0 gal106 L | Flex-fuelgas or E85 | 16 / 21 | 448 / 588 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 Sierra 1500 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 24.0-gallon tank covers about 456 miles.
| Gauge | Gallons | Highway miles | City miles |
|---|---|---|---|
| Full | 24.0 | 504 | 432 |
| 3/4 | 18.0 | 378 | 324 |
| 1/2 | 12.0 | 252 | 216 |
| 1/4 | 6.0 | 126 | 108 |
| 1/8 | 3.0 | 63 | 54 |
Over 15,000 miles a year (the EPA's yearly estimate) this configuration uses about 789 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.
What it costs to fill up a 2021 GMC Sierra 1500
$102.48 to fill the 24.0-gallon tank from empty with regular, at this week's US average of $4.27 a gallon.
| Tank | Fuel | US avg / gal | From empty | From 1/4 tank |
|---|---|---|---|---|
| 24.0 gal | Regular | $4.27 | $102.48 | $76.86 |
| 28.0 gal | Regular | $4.27 | $119.56 | $89.67 |
| 24.0 gal | Diesel | $6.35 | $152.40 | $114.30 |
| 28.0 gal | E85 (flex-fuel trims) | $3.31 | $92.68 | $69.51 |
By region, 24.0-gallon tank
| Region | Regular / gal | Fill from empty |
|---|---|---|
| East Coast | $4.02 | $96.48 |
| Midwest | $4.27 | $102.48 |
| Gulf CoastLowest | $3.70 | $88.80 |
| Rocky Mountain | $4.46 | $107.04 |
| West Coast | $5.42 | $130.08 |
| CaliforniaHighest | $5.89 | $141.36 |
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
- 24.0-gallon tank$102.48
- 28.0-gallon tank$119.56
- A year of driving (15,000 mi)$3,371
Starts at the US average for regular; type in what your station charges. For other tank sizes, use the fill-up calculator.
Sierra 1500 tank size in other years
The 2021 Sierra 1500 uses the same 24.0–28.0 gal tank sizes as every Sierra 1500 since 2019.
| Model year | Tank | Longest highway range |
|---|---|---|
| 2026 Sierra 1500 | 24.0–28.0 gal | 588 mi |
| 2025 Sierra 1500 | 24.0–28.0 gal | 624 mi |
| 2024 Sierra 1500 | 24.0–28.0 gal | 616 mi |
| 2023 Sierra 1500 | 24.0–28.0 gal | 616 mi |
| 2022 Sierra 1500 | 24.0–28.0 gal | 616 mi |
| 2021 Sierra 1500 | 24.0–28.0 gal | 624 mi |
| 2020 Sierra 1500 | 24.0–28.0 gal | 588 mi |
| 2019 Sierra 1500 | 24.0–28.0 gal | 588 mi |
| 2018 Sierra 1500 | 26.0–34.0 gal | 816 mi |
| 2017 Sierra 1500 | 26.0–34.0 gal | 816 mi |
| 2016 Sierra 1500 | 26.0–34.0 gal | 816 mi |
- 2026
- 2025
- 2024
- 2023
- 2022
- 2021
- 2020
- 2019
- 2018
- 2017
- 2016
- 2015
- 2014
- 2013
- 2012
- 2011
- 2010
- 2009
- 2008
- 2007
- 2006
- 2005
- 2004
- 2003
- 2002
- 2001
- 2000
- 1998
- 1997
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- 1995
- 1994
- 1993
- 1992
- 1991
- 1990
2021 GMC Sierra 1500 vs similar 2021 pickups
At 28.0 gallons, the Sierra 1500's largest tank ranks fourth of the five 2021 pickups compared here. The Toyota Tundra carries the most (38.0 gal) and the Chevrolet Silverado 1500 the least (28.0 gal).
| 2021 model | Tank | Longest highway range |
|---|---|---|
| Toyota Tundra | 26.4–38.0 gal | 646 mi |
| Ford F-150 | 23.0–36.0 gal | 676 mi |
| Ram 1500 Classic | 26.0–32.0 gal | 800 mi |
| GMC Sierra 1500 | 24.0–28.0 gal | 624 mi |
| Chevrolet Silverado 1500 | 24.0–28.0 gal | 588 mi |
Picked by body style and size: other 2021 pickups within about 5% of the Sierra 1500's length and 15% of its curb weight, one model per brand.
2021 GMC Sierra 1500 fuel system recalls
None of the 7 recalls NHTSA lists for the 2021 GMC Sierra 1500 involve the fuel system.
2021 GMC Sierra 1500 fuel pump and gauge parts
NHTSA lists no fuel-system recall for the 2021 GMC Sierra 1500, so a failed pump or gauge is a normal repair. These are the part numbers the makers list for it.
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Frequently asked questions
What is the fuel tank capacity of the 2021 GMC Sierra 1500?
The 2021 GMC Sierra 1500 holds between 24.0 and 28.0 gallons, depending on the trim. 24.0 gallons is the usual size; the 28.0-gallon tank comes on the 2dr Regular Cab 4WD LB (4.3L 6cyl 6A).
How many gallons and liters does the 2021 GMC Sierra 1500 gas tank hold?
The 2021 GMC Sierra 1500 tank holds 91–106 liters, or 24.0–28.0 gallons in US gallons.
Which 2021 GMC Sierra 1500 has the biggest gas tank?
The 28.0-gallon tank is on the 2dr Regular Cab 4WD LB, 2dr Regular Cab LB. The smallest tank, 24.0 gallons, is on the 4dr Crew Cab 4WD 5.8 ft. SB.
Does the 2021 GMC Sierra 1500 tank change with the powertrain?
Yes. Gas: 24.0 gal; Flex-fuel (E85): 24.0–28.0 gal; Diesel: 24.0 gal.
Does 4WD change the 2021 GMC Sierra 1500 gas tank?
No. 4WD and RWD versions of the 2021 GMC Sierra 1500 use the same 24.0–28.0 gal tank.
How far can a 2021 GMC Sierra 1500 go on a full tank?
About 480–624 miles on the highway and 360–528 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 Sierra 1500 go on a quarter tank?
About 126 highway miles or 108 in town from the 24.0-gallon tank, which has roughly 6.0 gallons left at the quarter mark. Gauges aren't exact, so treat that as a guide.
What gas does the 2021 GMC Sierra 1500 take?
Regular unleaded, or Flex-fuel (unleaded/E85), or Diesel fuel, 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 Sierra 1500?
At the US average of $4.27 a gallon for regular (EIA, week of October 26, 2026), filling the 24.0-gallon tank from empty costs $102.48. It ranges from $88.80 in the Gulf Coast to $141.36 in California.
How much does a full tank of gas weigh in a 2021 GMC Sierra 1500?
About 174 pounds for the 28.0-gallon tank. Gasoline weighs roughly 6.2 pounds a gallon.
Does the 2021 GMC Sierra 1500 have a bigger gas tank than the Chevrolet Silverado 1500?
No, they match: both top out at 28.0 gallons in 2021.
Has the 2021 GMC Sierra 1500 had a fuel pump or fuel system recall?
No. None of the 7 recalls NHTSA lists for the 2021 GMC Sierra 1500 involve the fuel system.
Sources
- Tank sizes: manufacturer-rated capacities from US-market specifications, cross-checked against a second spec database. Updated October 2026.
- MPG and range: EPA ratings. Range is tank size times EPA MPG.
- Fuel prices: U.S. Energy Information Administration, week of October 26, 2026.
- Recalls: NHTSA recall database.
Does your owner's manual say something different? Let us know and we'll fix it. More on how we check the numbers.