Fuel Reserve Range Calculator
Fuel Reserve Range Calculator. Account for a chosen fuel reserve. Enter your values and view the result.
Fuel Reserve Range Calculator
Account for a chosen fuel reserve.
Use the calculation engine below to model your exact costs with custom fuel prices, distances, and vehicle efficiencies:
Fuel Reserve Range Calculator: inputs
Adjust sliders or enter exact figures
Monthly Fuel Budget
Real-Time Visual Breakdown
Comparing your expense against alternative vehicle classes
Price Fluctuation Stress Test
See how unexpected gas price surges would impact your monthly budget
How Fuel Reserve Range Calculator Works
This tool works by subtracting a chosen fuel reserve from the fuel on board and showing the range before the reserve is touched.
- Step 1
Enter fuel on board
Type the current fuel in gallons or liters.
- Step 2
Choose a reserve
Enter a fixed amount, such as 2 gallons (7.6 L), or a share of the tank, such as 15%.
- Step 3
Enter fuel economy
Type the MPG or L/100 km for the route.
- Step 4
Read the usable range
The calculator shows usable range, reserve range, and total range.
Fuel Reserve Range Calculator Formula
The formula subtracts the reserve before multiplying by fuel economy.
Usable Fuel = Fuel on Board − Reserve
Usable Range = Usable Fuel × MPG
Reserve Range = Reserve × MPG
- Reserve
- = fuel held back for emergencies
- Usable Range
- = distance before the reserve is used
Worked Example
- A driver has 9 gallons (34.1 L) in a 15-gallon tank, keeps a 2.5-gallon (9.5 L) reserve, and gets 28 MPG.
- Usable fuel = 9 − 2.5 = 6.5 gallons (24.6 liters).
- Usable range = 6.5 × 28 = 182 miles (293 km).
- Reserve range = 2.5 × 28 = 70 miles (113 km).
Fuel Reserve Range Calculator Conversion Table
The table converts reserve sizes into reserve range and usable range from a full 15-gallon (56.8 L) tank at 28 MPG.
| Reserve (% of Tank) | Reserve (gal / L) | Reserve Range (mi / km) | Usable Range from Full (mi) | Usable Range from Full (km) |
|---|---|---|---|---|
| 5% | 0.75 / 2.8 | 21 / 34 | 399 | 642 |
| 10% | 1.50 / 5.7 | 42 / 68 | 378 | 608 |
| 15% | 2.25 / 8.5 | 63 / 101 | 357 | 575 |
| 20% | 3.00 / 11.4 | 84 / 135 | 336 | 541 |
| 25% | 3.75 / 14.2 | 105 / 169 | 315 | 507 |
What is a Fuel Reserve Range Calculator?
A Fuel Reserve Range Calculator is a safety planning tool that accounts for a chosen fuel reserve when calculating range.
Running a tank to empty risks a breakdown and can damage the in-tank fuel pump, which uses fuel for cooling. A fixed reserve keeps a buffer for traffic jams, closed stations, and detours. The Fuel Reserve Range Calculator plans driving around that buffer.
Remote travel calls for bigger reserves. Drivers crossing deserts or mountain routes often keep 20% to 25% in reserve.
What are the uses of a Fuel Reserve Range Calculator?
There are 4 main uses of the Fuel Reserve Range Calculator, including safe refuel planning, remote travel, and fleet refuel rules.
Plan safe refuels
Refuel before the reserve is reached.
Prepare for remote routes
Set a larger reserve for long gaps between stations.
Set fleet refuel rules
Require drivers to refuel at a set reserve level.
Protect the fuel pump
Avoid running the tank near empty.