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Estimate a fill-up with this formula: tank capacity × (1 − current fill fraction) × price per gallon or liter. For example, a 15-gallon tank that is half full, at $3.50 per gallon, would cost about $26.25 to fill: 15 × 0.5 × $3.50. This is an illustrative estimate, not a quote from a specific station.
Calculate the cost to fill your tank
Use the vehicle’s tank capacity, how full it is now, and the price of the fuel you plan to buy. CalculatorLib describes the same approach: multiply tank size by price per unit, using only the unfilled share for a partial tank. See CalculatorLib’s fill-tank calculation.
| # | Preview | Product | Price | |
|---|---|---|---|---|
| 1 |
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Dorman 576-343 Fuel Tank | $137.29 | Buy on Amazon |
| 2 |
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Dorman 576-121 Fuel Tank | $105.77 | Buy on Amazon |
| 3 |
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EVIL ENERGY 15 Gallon Fuel Cell Gas Tank with Level Sender, Aluminum, Black | $159.99 | Buy on Amazon |
| 4 |
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Dorman 576-341 Steel Front Fuel Tank with Gaskets Included | $165.99 | Buy on Amazon |
| 5 |
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munirater 5 Gallon 19 L Universal Fuel Cell Tank | $71.35 | Buy on Amazon |
Estimated fill cost = C × (1 − f) × P, where C is tank capacity, f is the current fill fraction from 0 to 1, and P is the price per unit of volume. If the tank is empty, f is 0; if it is half full, f is 0.5. If a calculator asks for a percentage, divide it by 100: a tank at 25% needs about 75% of its capacity.
Example: a partly full tank
For a 15-gallon tank that is half full, with gasoline at $3.50 per gallon, the calculation is 15 × (1 − 0.5) × $3.50 = $26.25.
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- Reliable replacement - this fuel tank directly replaces the original fuel tank on specified vehicle years, makes and models
- Durable construction - this fuel tank is made from the same rugged materials as the original part for dependable service
- Quality assured - this part has been validated to ensure a quality fit and long service life
- Trustworthy design - backed by team of product specialists in the United States
- Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool
Example: a tank filled from empty
For a 15-gallon tank filled from empty at $3.50 per gallon, the estimate is 15 × (1 − 0) × $3.50 = $52.50.
What to enter for a useful estimate
- Tank capacity: Use gallons with a price per gallon, or liters with a price per liter. A vehicle’s owner’s manual or specifications can help identify the rated capacity.
- Current fuel level: Estimate the share of the tank already filled. The dashboard gauge is approximate, so this input can be a significant source of uncertainty.
- Fuel price: Use the price for the correct fuel type or grade at the place you expect to refuel. A national average is useful for planning, but it is not a station quote.
- Date and location: Keep the observation date with any quoted price and match its geography to your planned purchase as closely as possible.
Where to find a fuel price
AAA offers a price finder that accepts a city, state, or ZIP code and says its prices are updated daily. That can help when estimating a particular local fill-up. Find current gas prices near you with AAA.
Rank #2
- Reliable replacement - this fuel tank directly replaces the original fuel tank on specified vehicle years, makes and models
- Durable construction - this fuel tank is made from the same rugged materials as the original part for dependable service
- Quality assured - this part has been validated to ensure a quality fit and long service life
- Trustworthy design - backed by team of product specialists in the United States
- Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool
The U.S. Energy Information Administration (EIA) publishes weekly U.S. and regional retail price series. Use these for broader comparisons or planning, not as a substitute for the price at a particular pump. AAA’s daily local listings and EIA’s weekly series have different coverage and reporting windows, so label the source and date when comparing them. View EIA gasoline and diesel price updates.
Dated U.S. price examples
These figures show why a calculator needs a clearly matched fuel type, series, and date. They are U.S. reference prices for the dates shown, not universal or guaranteed pump prices.
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Rank #3
- Size: The fuel cell measures 19" (L) × 17" (W) × 10.03" (H). The mounting tab has a diameter of 3.46", and the inlet/outlet fitting size is 10AN.
- Application: This gas fuel cell is compatible with fuel and diesel. It is not suitable for use with alcohol, methanol, water, or ethanol.
- Features: The package includes one aluminum fuel cell with a built-in 3–90 ohm level sensor and internal anti-slosh foam.
- Material: The drift fuel cell tank is made of 1060-H24 aluminum alloy, and the cover is made of plastic.
- Note: Anti-slosh foam is built inside the fuel cell tank to improve fuel delivery and prevent flashback explosions. Please check the foam regularly for deterioration.
| Source and observation | Fuel category | Price |
|---|---|---|
| EIA update released October 6, 2026; week/date of October 5, 2026 | Regular gasoline | $4.354 per gallon |
| EIA update released October 6, 2026; week/date of October 5, 2026 | On-highway diesel | $6.199 per gallon |
| EIA weekly retail series; October 5, 2026 observation | All-grades retail gasoline | $4.496 per gallon |
| AAA national average; October 8, 2026 | Regular gasoline | $4.3612 per gallon |
EIA says its cited prices include taxes. Its all-grades figure differs from its regular-gasoline figure because it represents a different grade aggregation. AAA’s national regular average is another series with its own date and scope. See the EIA update, EIA all-grades retail gasoline series, and AAA Fuel Prices.
Why the result can differ from your receipt
The formula estimates cost from the inputs; it does not measure fuel in the tank or guarantee how much the pump will dispense. The level shown by the vehicle and the actual local price may differ from the estimates used, so the receipt can come out higher or lower. The sources cited here do not quantify a typical difference.
Rank #4
- Reliable replacement - this fuel tank directly replaces the original fuel tank on specified vehicle years, makes and models
- Durable construction - this fuel tank is made from the same rugged materials as the original part for dependable service
- Quality assured - this part has been validated to ensure a quality fit and long service life
- Trustworthy design - backed by team of product specialists in the United States
- Ensure fit - Input your vehicle into the garage tool and check Confirmed Fit bar at the top of the page. If there is an “i” in a blue circle, additional verification is needed. Please hover over the "i" to verify fitment notes match your vehicle.
For a more realistic estimate on an ordinary stop, use the unfilled portion of the tank rather than multiplying the entire rated capacity by the price. Tank capacity is most useful for estimating a fill from empty; when fuel remains, the amount purchased depends on how much is left.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Track fuel spending over time
A fill-up estimate answers what one stop may cost. To understand your own fuel economy and cost per mile, AAA’s 2020 driving-cost guide recommends recording the odometer reading, gallons purchased, and amount paid at fill-ups. Read AAA’s guide to calculating driving costs.
Quick Recap
Best Value
- 5-gallon / 19L universal fuel cell tank and cap, made of good quality aluminum, lightweight and easy to clean
- Tank measures: 12 (L) x 12 (W) x 8 (H) Mounting Tabs Measure 13-1/2 (L) x 9-3/4 (W) Center to Center
- Complete mounting openings and port positions align with standard vehicle hardware for compatible replacement scenarios
- Universal Appliction to Hot Rod/Street Racing/Track Cars/Truck/SUVs . Please Refer to Measurement and Make Sure it can be Mounted to Your Desired Location
- Easy to install and maintain, Include a fuel tank with level sensor and replaceable anti slosh foam in tank
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
