How big is the gas tank on a 5.7 Tundra?

The gas tank for most Toyota Tundra models powered by the 5.7-liter i-Force V8 is large, typically around 38 gallons, but exact capacity depends on cab size and bed length.

Engine and configuration context

Historically, the 5.7L i-Force V8 was used in the first-generation Tundra (roughly 2007–2021). Tank size varied by cab and bed configuration, with some setups carrying about 34 gallons and others about 38 gallons. In the current Tundra lineup (introduced in 2022), Toyota shifted to a different engine lineup and the 5.7L V8 is no longer offered, so the exact tank sizes depend on the alternative engines and trims rather than the 5.7L. For the purpose of this article, we focus on configurations that used the 5.7L V8.

Tank size by configuration

Below are common ranges for the 5.7L Tundra, recognizing that exact capacity varies by market, bed length, and cab style. The values given are approximate.

• 38 gallons (approximately 144 liters) for many CrewMax or Double Cab configurations with a longer bed.


• 34 gallons (approximately 129 liters) for some Short-Bed or certain cab-and-bed combinations.


• In rare or region-specific configurations, capacities may fall slightly outside this range due to equipment changes or factory options.

The takeaway is that most 5.7L Tundra configurations fall in the mid-to-high 30s of gallons, with a lower 30s figure for shorter-bed setups.

How to confirm your exact capacity

Use these quick checks to verify the tank size on your specific truck:

• Consult the owner's manual, which lists fuel-tank capacity in the specifications section.


• Look at the door-jamb sticker or fuel-filler door label for the capacity value (in gallons or liters).


• Check Toyota's official specifications for your model year and trim on Toyota's website or in the dealership documentation.

Verification is essential because production changes over years and markets can produce variations in tank capacity even among similar-looking trucks.

Summary

For the classic 5.7L Tundra, anticipate a fuel tank in the high 30s of gallons, commonly around 38 gallons for many configurations, with some shorter-bed versions closer to 34 gallons. If you’re researching a modern Tundra, note that the current lineup emphasizes newer engines and may not use the 5.7L V8.

How many gallons does a 5.7 Tundra hold?

38.0 gal
494.0/646.0 mi. 38.0 gal.

How big is the Tundra gas tank?

The Toyota Tundra has a fuel tank capacity of 32.2 gallons for most 2025 and 2026 models, though some configurations may have a smaller 22-gallon or 22.5-gallon tank. It is best to check the specific model year and trim level for the most accurate information, as some tanks are optional.
 
2025 and 2026 models

• 32.2 gallons: This is the standard size for many 2025 and 2026 models, including hybrid and non-hybrid trims. 
• 22.5 gallons: Some configurations, particularly the SR5 trim with a 6.5-foot bed, may come with a 22.5-gallon tank. 

Other options

• 22 gallons: Some owners have noted that certain configurations have a 22-gallon tank. 
• Aftermarket tanks: For older models, aftermarket options include a 46-gallon replacement tank for 2007-2021 models, notes TankAndBarrel.com. 

What is the gas mileage on a Toyota Tundra 5.7 L v8?

The 5.7L V8 Toyota Tundra gets an estimated 13 mpg city / 17 mpg highway for models like the 2021, while real-world mileage is often around 13-14 mpg overall. Factors like speed, driving conditions (city vs. highway), and vehicle modifications (like oversized tires) significantly impact fuel economy. 
EPA estimates vs. real-world results

• EPA Estimated: Roughly 13 mpg city / 17 mpg highway and 15 mpg combined for recent models. 
• Real-World Average: Typically ranges from 13 to 14 mpg, depending on driving habits. 

This video discusses the real-world gas mileage of a 5.7L Toyota Tundra on a road trip: 59sDanny Johnson’s GarageYouTube · Jul 7, 2023
How driving conditions affect MPG

• Highway driving: You can expect to get closer to the EPA's highway estimate of 17-18 mpg, especially at steady speeds like 70 mph. 
• City driving: Fuel economy drops to around 13 mpg due to stop-and-go traffic. 
• Speed: Higher speeds decrease fuel economy; for example, driving at 80 mph can lower MPG to about 16 mpg. 
• Towing or heavy loads: Towing will reduce MPG.
• Tire and vehicle modifications: Aftermarket tires, especially oversized ones, can lower your actual MPG and may affect the accuracy of your truck's computer. 

Tips to improve MPG

• Drive at steady speeds: Use cruise control on the highway and avoid rapid acceleration. 
• Maintain your vehicle: Ensure proper tire pressure and keep up with maintenance, such as cleaning the MAF sensor and throttle body. 
• Consider a bed cover: Aerodynamic accessories can help improve fuel efficiency. 

This video tests the real-world fuel economy of a 2020 Toyota Tundra 5.7L with 35-inch tires: 59s4WD is LifeYouTube · Nov 23, 2021

What year does Tundra have a 38 gallon tank?

Fits TUNDRA (2014 - 2021)
38 GALLON. Tundra; w/38 Gallon.