How big is the gas tank on a Suburban?
The typical Suburban fuel tank is about 31 gallons, giving a solid driving range between fills. Exact capacity can vary slightly by model year, engine choice, and drivetrain configuration.
Typical capacity in modern Suburbans
In the current generation (roughly 2015 to present), the Suburban generally uses a 31-gallon fuel tank. This size applies across most trims and configurations, including 2WD and 4WD versions.
The following figures summarize the commonly observed tank sizes by era. Note that exact capacity can vary by drivetrain and regional specifications.
- Modern Suburban (2015–present): 31 gallons (approximately 117.5 liters)
- Earlier generations (pre-2015): capacity varied by year and engine, typically ranging from about 28 to 31 gallons
In everyday terms, most drivers can expect a similar range across these generations, once factors like engine efficiency and payload are considered.
Notes on variations and exceptions
There are exceptions based on drivetrain (2WD vs 4WD), optional towing packages, and regional market differences. The nominal capacity tends to stay around the same ballpark, but exact figures can differ by year and trim. Always check the specific vehicle’s specification sheet for precise numbers.
Diesel engines and long-wheelbase variants
The Suburban’s common 31-gallon tank size typically applies to models with gasoline engines as well as the 3.0L Duramax diesel, though regional specs or year-specific tweaks can influence usable capacity or reserve amounts. If you’re shopping used, confirm the exact figure for the model year and drivetrain of interest.
Impact on range and fueling strategy
A 31-gallon tank supports long highway trips and substantial range between stops, especially when paired with efficient powertrains and favorable driving conditions. Real-world range depends on engine choice, payload, driving style, and weather or terrain.
Summary
The Suburban typically carries a 31-gallon gas tank in modern models, delivering a generous driving range between fill-ups. Older generations show a bit more variation (roughly 28–31 gallons) depending on year and configuration. For precise numbers, check the vehicle’s original specification sheet for the exact model year and drivetrain.
What is the fuel capacity of a Suburban?
Suburban gas tank size varies by model year, but recent models (2021 and newer) typically have a 28-gallon tank. Older models, particularly those from around 2015 to 2020, often had a larger 31-gallon tank. Some very old models may have different capacities, with older diesel models sometimes having 42-gallon tanks, and certain 1987-1991 models coming with 40-gallon options.
- Recent models (2021-present): 28 gallons
- Older models (approx. 2015-2020): 31 gallons
- Older Suburban models (e.g., 1987-1991): Options like 40 gallons for gas or 42 gallons for diesel were available
How big is a Suburban gas tank?
A modern Chevrolet Suburban typically has a 28-gallon fuel tank, but the size can vary for older models or specific configurations. Older models and some specialized versions, such as those with longer wheelbases or diesel engines, may have larger tanks, with some aftermarket options reaching up to 40 gallons or more.
- Standard modern capacity: The 2025 Suburban has a 28-gallon fuel tank.
- Older models: Tank sizes have varied throughout the years. For example, some 2018 models had a 31-gallon tank, and models from the late 80s and early 90s could have 31 or 40-gallon tanks.
- Aftermarket and specialized: For increased range, some aftermarket tanks are available that can provide significantly more capacity, with some aftermarket and conversions offering as much as 40, 50, or even 80 gallons, say Amazon and Reddit users.
- Diesel models: Some older diesel Suburban models, like the K1500 with a 6.5L diesel, could have 42-gallon tanks, note Amazon and Reddit users.
How big is the gas tank on a 2025 Suburban?
The 2025 Chevrolet Suburban has a fuel tank capacity of 28 gallons, which is standard across all its trim levels.
- Capacity: 28.0 gallons
- Trim Levels: The 28-gallon capacity is consistent across all six trims.
How big is a 2019 Suburban gas tank?
31.0 gal.
Fuel & MPG
| EPA combined MPG | 16 MPG |
|---|---|
| Range in miles (city/hwy) | 434.0/651.0 mi. |
| Fuel tank capacity | 31.0 gal. |
| CO2 Emissions | 8.6 tons |
