By Editorial Team · Reviewed against Toyota and U.S. fuel-economy sources · Last updated July 31, 2026
Toyota Tundra fuel tank size is 26.4 gallons for 2000 to 2006 U.S. models, 26.4 or 38 gallons for 2007 to 2021 trucks, and 22.5 or 32.2 gallons for 2022 to 2025 configurations. Toyota made the 32.2-gallon tank standard on every U.S.-market 2026 Tundra grade. Because SR5 equipment can vary by cab, bed, drivetrain, and package, use the window sticker or a Toyota dealer’s VIN build sheet to confirm an individual truck.
Quick Answer
A U.S.-market 2026 Tundra has a 32.2-gallon factory tank on every grade, according to Toyota. For 2022 to 2025 trucks, both 22.5- and 32.2-gallon configurations exist. First-generation 2000 to 2006 trucks use 26.4 gallons. Many 2007 to 2021 trucks also use 26.4 gallons, while specified 2016 to 2021 trims and packages use 38 gallons.
Key Takeaways
- All U.S.-market 2026 Tundra grades use a 32.2-gallon factory tank.
- For 2022 to 2025 trucks, verify the exact configuration because both 22.5- and 32.2-gallon tanks appear in the lineup.
- First-generation 2000 to 2006 trucks use 26.4 gallons; many 2007 to 2021 trucks do too.
- Select 2016 to 2021 trims and packages use the larger 38-gallon tank.
- Rated capacity is not the same as the amount added at a normal fill-up because fuel remains in the tank and nozzle shutoff varies.
- Use the window sticker or VIN build sheet as primary proof, then use several fill-up logs as a practical cross-check.
What’s in This Article
- What Fuel Tank Sizes Does the Toyota Tundra Have?
- Which Tundra Years and Trims Use Each Fuel Tank Size?
- What Changed for the 2026 Tundra Fuel Tank?
- How Much Usable Fuel Is in the Tank?
- Why Miles-to-Empty and Your Fuel Gauge Can Mislead
- Why Fill-Up Volume Can Be Lower Than Rated Capacity
- How Driving Style and Payload Change Range and MPG
- Safe Fueling Practices to Protect the Pump and EVAP
- How to Test Your Truck’s Practical Range and Gauge
- Aftermarket Long-Range Tanks and Replacement Options
What Fuel Tank Sizes Does the Toyota Tundra Have?
Toyota Tundra fuel tank capacity varies by generation, model year, trim, market, and package. U.S. first-generation trucks from 2000 to 2006 use a 26.4-gallon tank; Toyota’s 2000 owner’s manual lists the capacity as 100 liters, or 26.4 U.S. gallons. Many second-generation 2007 to 2021 trucks also use 26.4 gallons.
For 2016, Toyota announced a 38-gallon tank for Limited, Platinum, 1794 Edition, and TRD Pro models. The larger tank also appeared with specified 5.7L V8 SR5 upgrade packages, so owners should verify the factory build rather than rely on the trim badge alone.
Third-generation 2022 to 2025 trucks can have 22.5 or 32.2 gallons. The U.S. Department of Energy lists the 2025 Tundra’s tank-size range as 22.5 to 32.2 gallons. For 2026, Toyota removed the smaller option and made the 32.2-gallon tank standard across all U.S. grades.
Tank size affects fuel-stop planning more than fuel economy itself. A 32.2-gallon tank at 20 miles per gallon (mpg) gives 644 miles by simple multiplication, but a conservative plan should leave a buffer for reserve fuel, weather, terrain, speed, payload, and towing.
Pro tip: Use the original window sticker or a dealer-provided VIN build sheet as your primary proof. One pump receipt cannot confirm rated capacity because fuel remains in the tank and automatic nozzle shutoff varies.
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Common Factory Tundra Fuel Tank Sizes in Gallons and Liters
Toyota and U.S. fuel-economy sources list capacity in U.S. gallons. The liter values below are rounded conversions using 1 U.S. gallon = 3.785 liters. The planning-range column uses 18 mpg and 90% of rated capacity, leaving a 10% buffer. It is a route-planning estimate, not a promise of usable fuel or reserve size.
| Tank Size | Approx. Liters | Where You May See It | Planning Range at 18 mpg |
|---|---|---|---|
| 22.5 gal | 85.2 L | 2022 to 2025 SR and many SR5 builds | About 365 mi |
| 26.4 gal | 99.9 L | 2000 to 2006 trucks and many 2007 to 2021 builds | About 428 mi |
| 32.2 gal | 121.9 L | Many higher 2022 to 2025 trims, some SR5 builds, and all 2026 grades | About 522 mi |
| 38 gal | 143.8 L | Select 2016 to 2021 trims and packages | About 616 mi |
Which Tundra Years and Trims Use Each Fuel Tank Size?
Start with the model year, then confirm the exact factory configuration. The first generation is straightforward at 26.4 gallons. Second-generation trucks can use 26.4 or 38 gallons from 2016 onward. Third-generation 2022 to 2025 trucks can use 22.5 or 32.2 gallons, while every U.S.-market 2026 grade uses 32.2 gallons.
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Model-Year and Trim Breakdown
The table below is a selection guide, not a substitute for the individual truck’s build record. SR5 equipment is the main trouble spot because tank size can change with cab, bed, drivetrain, and option package.
| Year Range | Typical U.S. Configuration | Tank (gal) | Verification Note |
|---|---|---|---|
| 2000 to 2006 | First-generation Tundra | 26.4 | Toyota owner’s-manual capacity |
| 2007 to 2015 | Second-generation Tundra | 26.4 | Confirm market and factory build |
| 2016 to 2021 | SR and many SR5 builds | 26.4 | SR5 packages can differ |
| 2016 to 2021 | Limited / Platinum / 1794 / TRD Pro / select SR5 5.7L packages | 38 | Verify the window sticker or VIN build sheet |
| 2022 to 2025 | SR and many SR5 builds | 22.5 | Some SR5 configurations use 32.2 |
| 2022 to 2025 | Many higher trims and some SR5 configurations | 32.2 | Confirm the individual build |
| 2026 | All U.S. grades | 32.2 | Standard across the lineup |
What Changed for the 2026 Tundra Fuel Tank?
Toyota eliminated the 22.5-gallon option for the 2026 U.S. lineup. The company states that every grade, including SR and SR5, receives the 32.2-gallon tank. Compared with a 22.5-gallon truck, that adds 9.7 gallons of rated capacity. At the same mpg, the larger tank extends theoretical range by about 43%.
How Can You Confirm Your Tundra’s Tank Size?
Use this order of proof:
- Original window sticker: look for the fuel-tank capacity or a package that includes the larger tank.
- Toyota VIN build sheet: ask a dealer to retrieve the factory configuration from the vehicle identification number.
- Owner’s manual: use it to understand the capacities offered for that model year, but note that one manual may cover multiple configurations.
- Repeated fill-up logs: use several normal fill-ups as a practical cross-check, not as proof of rated capacity.
Fill to the first automatic click, record the gallons added, and repeat across several tanks. A consistent pattern can reveal your normal refill volume, but reserve fuel and nozzle behavior mean the pump total will usually be lower than the published capacity.
How Much Usable Fuel Is in the Tank?
Rated capacity is not the same as the amount added at a normal fill-up. Tank shape, baffling, pump pickup location, gauge calibration, fuel movement, and automatic nozzle shutoff all affect the number on the receipt. Treat the published capacity as the tank’s rated design volume, not as a target to dispense at every stop.
Usable Gallons vs. Rated Capacity
A Tundra with a 32.2-gallon tank may take far less than 32 gallons when the gauge reads low because fuel remains in the tank. The nozzle can also stop early because of truck angle, pump flow, fuel temperature, foaming, or vapor movement through the filler system.
The U.S. Department of Energy’s 2025 Tundra page lists a 22.5- to 32.2-gallon tank range and notes that its range calculation assumes fuel remains unused before refueling. For trip planning, this guide uses 90% of rated capacity as a simple buffer. Your own repeated fill-up logs are more useful than a universal reserve estimate.
How Much Fuel Is Left When the Warning Light Comes On?
Toyota does not publish one universal reserve figure for every Tundra year and configuration in the sources reviewed here. The remaining amount can vary with tank size, model year, slope, fuel movement, and gauge calibration. The warning light is a prompt to refuel soon, not proof that the tank has reached zero.
Do not try to measure reserve by driving until the engine stalls. A safer method is to refuel promptly after the warning appears, record the gallons added and miles driven, and repeat under similar conditions.
Estimated Range by Tank Size
The first three columns show simple full-capacity math. The last column shows a more conservative 90%-capacity plan at 18 mpg. Actual range can be lower when towing, idling, driving into wind, climbing grades, or using aggressive tires.
| Tank Size | At 15 mpg | At 18 mpg | At 20 mpg | 90% Plan at 18 mpg |
|---|---|---|---|---|
| 22.5 gal | 338 mi | 405 mi | 450 mi | 365 mi |
| 26.4 gal | 396 mi | 475 mi | 528 mi | 428 mi |
| 32.2 gal | 483 mi | 580 mi | 644 mi | 522 mi |
| 38 gal | 570 mi | 684 mi | 760 mi | 616 mi |
Why Miles-to-Empty and Your Fuel Gauge Can Mislead
Miles-to-empty and the fuel gauge are estimates. Toyota’s owner guidance notes that fuel movement during braking, acceleration, turns, inclines, and curves can change the gauge reading or make the low-fuel warning appear earlier than usual.
- Miles-to-empty follows recent fuel use: towing, payload, speed, grade, wind, and idling can change the estimate quickly.
- The gauge may not fall evenly: tank shape and fuel movement can make one part of the gauge last longer than another.
- The warning light is a refuel cue: it does not identify an exact number of gallons remaining.
- Fill volume can differ: reserve fuel, nozzle shutoff, pump flow, truck angle, and temperature affect how much you add.
- Your log gives the best planning number: miles driven divided by gallons added shows real tank-to-tank mpg.
Use the dashboard estimate, low-fuel warning, and trip log together. For remote travel or towing, plan from your lowest repeatable mpg and keep a larger buffer than you would for local driving.
Why Can Fill-Up Volume Be Lower Than Rated Capacity?
A Tundra can accept less fuel than its rated tank size because fuel remains in the tank when you stop. The low-fuel warning is a refueling cue, not proof that the tank is empty. Automatic nozzle shutoff, truck angle, fuel temperature, pump flow, and vapor movement can also change the amount shown on one receipt.
Do not compare one fill-up directly with the published capacity. Record at least three to five normal fill-ups using the first automatic click as your stopping point. A repeated pattern is more useful than one unusually high or low result.
| Record | Why It Matters |
|---|---|
| Miles driven | Shows distance covered since the last fill |
| Gallons added | Calculates tank-to-tank mpg and normal refill volume |
| Towing or payload | Explains higher fuel use under load |
| City, highway, terrain, wind, and weather | Adds context when range changes |
| Low-fuel warning status | Shows when the refill occurred relative to the warning |
Planning formula: lowest repeatable mpg × rated tank size × 0.90 = a conservative starting range. Example: 16 mpg × 32.2 gallons × 0.90 = about 464 miles. Refuel earlier when stations are sparse or conditions are worsening.
Calculate mpg by dividing miles driven by gallons added. Use the lowest repeatable result from similar conditions when planning a towing route or a trip through an area with long distances between fuel stations.
How Driving Style and Payload Change Range and MPG
Your actual range changes with how you drive and what you carry. Fuel economy shifts with acceleration, cruising speed, terrain, wind, tire choice, and payload. These factors often matter more than the tank size itself.
- Smooth acceleration and steady speeds help you use less fuel.
- Lower highway speeds can improve range on flat roads.
- Towing and heavy payloads increase engine load, especially on long trips.
- Lift kits and all-terrain tires can raise drag and rolling resistance.
- Trip logs help you spot patterns and plan better fuel stops.
Treat mpg as a number you can influence. Small habits, repeated every drive, can add real range over time.
Safe Fueling Practices to Protect the Pump and EVAP
Stop fueling at the first automatic click. Toyota’s third-generation Tundra Hybrid owner guidance says to secure the nozzle, stop after it automatically clicks off, and not top off the tank. AAA also explains that overfilling can send liquid fuel into vapor-control components designed to handle vapors, increasing the risk of EVAP or charcoal-canister problems.
Refuel before the tank is nearly empty, especially when towing, driving off-road, or traveling where fuel stations are far apart. Very low fuel reduces your safety margin and can allow fuel starvation during steep angles or hard cornering.
If the nozzle repeatedly clicks off when the tank is not full, try a different pump, slower flow, and a slightly different nozzle position. If the problem continues, inspect the filler neck, vent line, and EVAP system rather than forcing more fuel into the tank.
Warning: Do not run the engine until it stalls to test reserve capacity. The test can leave you stranded and may cause fuel starvation.
How to Test Your Truck’s Practical Range and Gauge
You can measure practical range without claiming to measure the tank’s physical capacity. Use the same fill method, stop at the first click, and record each tank. This produces repeatable trip-planning data without running the truck dry.
Follow these steps for a safe and consistent test:
- Fill the tank until the nozzle clicks off, then reset the trip odometer.
- Drive your normal routes until the low-fuel warning appears.
- Refuel soon after the warning instead of stretching the tank.
- Record the gallons added, miles driven, route type, and load.
- Divide miles driven by gallons added to calculate real mpg.
- Repeat the test during city driving, highway driving, and towing.
This data helps you plan fill-up stops and catch gauge problems early. If your fill pattern changes suddenly, inspect for leaks, sender faults, or venting issues.
Aftermarket Long-Range Tanks and Replacement Options
Aftermarket manufacturers list 46-gallon replacement tanks for specified 2007 to 2021 second-generation Tundras. These systems replace the original tank rather than adding a separate gravity-feed tank. Fitment is not universal, even within the stated year range.
For example, Transfer Flow’s current application is for 2007 to 2021 Double Cab and CrewMax gasoline trucks, is not compatible with flex-fuel Tundras, and replaces the 26-gallon original tank. For 2016 to 2021 trucks, it does not replace the factory 38-gallon tank. Match the current application guide to your VIN, cab, bed length, drivetrain, fuel type, original tank size, exhaust layout, and emissions configuration before ordering.
| Decision Check | What to Confirm | Why It Matters |
|---|---|---|
| Original tank | 26.4- or 38-gallon factory system | Some 46-gallon kits replace only the smaller tank |
| Vehicle fitment | VIN, cab, bed, drivetrain, and exhaust layout | Prevents ordering an incompatible system |
| Fuel and emissions | Gasoline or flex-fuel status and current emissions approval | Protects legal compliance and proper venting |
| Payload effect | Tank weight plus added fuel weight | A larger full tank reduces available payload |
| Installation | Installer qualifications, hoses, straps, sender, and leak test | Reduces fuel-system, gauge, and clearance problems |
Do not rely on a broad “50-state legal” statement without checking the exact part number and current approval documents. Emissions approval can be product-specific. Confirm the manufacturer’s current installation guide and any applicable California Air Resources Board Executive Order before purchase.
Use a qualified installer for a replacement tank. After installation, check sender operation, strap torque, filler and vent routing, exhaust clearance, and leaks. Reinspect the system after the first full tank and at the interval specified by the tank manufacturer.
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This replacement gas cap is designed to restore a tight fuel-tank seal, helping reduce vapor leaks, prevent check engine light issues, and maintain proper fuel system performance. Built in OE-style form for a wide range of Toyota and Lexus vehicles, it offers a direct DIY fix with durable materials for reliable, long-lasting use.
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Frequently Asked Questions
How Many Gallons Is a Toyota Tundra Gas Tank?
It depends on the model year and factory configuration. U.S. first-generation 2000 to 2006 trucks use 26.4 gallons. Many 2007 to 2021 trucks use 26.4 gallons, while select 2016 to 2021 trims and packages use 38 gallons. For 2022 to 2025, 22.5- and 32.2-gallon configurations exist. Every U.S.-market 2026 grade uses 32.2 gallons.
What Size Tank Does a 2000 to 2006 Tundra Have?
The U.S.-market first-generation Toyota Tundra uses a 26.4-gallon fuel tank. Toyota lists this as 100 liters in the owner’s manual.
What Is the Toyota Tundra SR5 Gas Tank Size?
SR5 capacity depends on year and equipment. Many 2022 to 2025 SR5 trucks use 22.5 gallons, while some configurations use 32.2 gallons. Some 2016 to 2021 SR5 5.7L packages use 38 gallons instead of 26.4. For 2026, every SR5 uses the 32.2-gallon tank.
Why Won’t My Tundra Take the Full Rated Capacity at the Pump?
Fuel remains in the tank when you refuel, even after the warning light appears. Pump flow, nozzle shutoff, truck angle, fuel temperature, foaming, and vapor movement can also affect how much you add. A smaller-than-rated fill-up does not prove that the truck has the wrong tank.
How Far Can a Toyota Tundra Go on a Full Tank?
A 32.2-gallon Tundra at 20 mpg gives 644 miles by simple multiplication. A 90% planning buffer lowers that example to about 580 miles. Towing, payload, tires, wind, terrain, speed, idling, and fuel-station spacing can reduce practical range further.
What Does the Tundra Low-Fuel Warning Light Mean?
The low-fuel warning means you should refuel soon. It does not mean the tank is empty or identify one universal reserve amount. Track repeated fill-ups under similar conditions to learn your truck’s normal refill pattern.
Can I Upgrade My Tundra to a Larger Fuel Tank?
Some manufacturers list 46-gallon replacement tanks for specified 2007 to 2021 second-generation Tundras. One current Transfer Flow application fits Double Cab and CrewMax gasoline trucks with the smaller original tank and excludes flex-fuel models. Confirm the exact part number, original tank, VIN, cab, bed, drivetrain, fuel type, and emissions approval before purchase.
How Do I Tell If My 2026 Tundra Has the Large Tank?
Toyota made the 32.2-gallon tank standard on all U.S.-market 2026 Tundra grades. Confirm the individual truck with the original window sticker or a dealer-provided VIN build sheet.
Conclusion
Identify the rated tank with the window sticker or a Toyota VIN build sheet, then use repeated fill-up logs to plan practical range. U.S.-market 2000 to 2006 trucks use 26.4 gallons; later trucks can vary by trim and package; and every 2026 grade uses 32.2 gallons. Before a long tow or remote trip, calculate from your lowest repeatable mpg, keep a fuel buffer, and schedule the next stop before the warning light becomes urgent.
References
- 2026 Toyota Tundra: A Bold New Chapter in Full-Size Pickup Excellence, Toyota USA Newsroom, July 22, 2025
- Toyota Tundra: Big, Brawny and Brainy All-American Full-Size Pickup, Toyota USA Newsroom, September 9, 2015
- 2000 Toyota Tundra Owner’s Manual, Toyota Motor Sales, U.S.A., fuel-tank capacity specification
- 2025 Toyota Tundra Full Specifications, Toyota Motor Sales, U.S.A., accessed July 31, 2026
- 2025 Toyota Tundra 4WD Fuel Economy and Tank-Size Range, U.S. Department of Energy and U.S. Environmental Protection Agency, accessed July 31, 2026
- 2023 Toyota Tundra Hybrid: Opening the Fuel Tank Cap, Toyota Owners
- 46-Gallon Toyota Tundra Midship Replacement Fuel Tank, Transfer Flow, accessed July 31, 2026
- Is It Bad to Top Off Your Gas Tank?, AAA Club Alliance, April 23, 2026
[…] Stop refueling when the pump nozzle first clicks off. Do not top off the tank. Toyota warns that adding more fuel after automatic shutoff can damage fuel or emissions-system components. For related refueling and tank information, see the Toyota Tundra fuel-tank guide. […]