Multiple-Fill Fuel Economy Calculator
Multiple-Fill Fuel Economy Calculator. Aggregate distance and fuel purchases. Enter your values and view the result.
Multiple-Fill Fuel Economy Calculator
Aggregate distance and fuel purchases.
Use the calculation engine below to model your exact costs with custom fuel prices, distances, and vehicle efficiencies:
Multiple-Fill Fuel Economy 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 Multiple-Fill Fuel Economy Calculator Works
This tool works by adding the distance and fuel from several fill-ups and dividing total distance by total fuel.
- Step 1
Start with a full tank
The first full fill sets the baseline. Its fuel is not counted.
- Step 2
Log every following fill
Enter the distance since the previous fill and the fuel added each time.
- Step 3
Include partial fills
Partial fills count. The total stays accurate once the last fill is full.
- Step 4
Read the aggregate figure
The calculator shows MPG per fill and the cumulative MPG across all fills.
Multiple-Fill Fuel Economy Calculator Formula
The formula divides total distance by total fuel across all logged fills.
Aggregate MPG = Σ Miles ÷ Σ Gallons
Cumulative MPG after fill k = Σ Miles(1…k) ÷ Σ Gallons(1…k)
- Σ Miles
- = total distance across logged fills
- Σ Gallons
- = total fuel added across the same fills
Worked Example
- A driver logs 5 fills after the baseline fill: 1,657 miles (2,667 km) and 59.2 gallons (224.1 liters) in total.
- Aggregate MPG = 1,657 ÷ 59.2 = 28.0 MPG (8.4 L/100 km).
- Single-fill results range from 23.8 to 31.2 MPG.
- The aggregate smooths out pump-click error and short-term driving changes.
Multiple-Fill Fuel Economy Calculator Conversion Table
The table shows single-fill and cumulative fuel economy for 5 logged fills.
| Fill | Miles (km) | Gallons (L) | Fill MPG | Cumulative MPG | Cumulative L/100 km |
|---|---|---|---|---|---|
| 1 | 402 (647) | 12.9 (48.8) | 31.2 | 31.2 | 7.5 |
| 2 | 288 (463) | 11.6 (43.9) | 24.8 | 28.2 | 8.4 |
| 3 | 356 (573) | 12.2 (46.2) | 29.2 | 28.5 | 8.3 |
| 4 | 240 (386) | 10.1 (38.2) | 23.8 | 27.5 | 8.6 |
| 5 | 371 (597) | 12.4 (46.9) | 29.9 | 28.0 | 8.4 |
What is a Multiple-Fill Fuel Economy Calculator?
A Multiple-Fill Fuel Economy Calculator is a fuel economy tool that aggregates distance and fuel purchases across several fill-ups for a stable average.
One fill-up gives a noisy figure. A highway week and a city week can differ by 7 MPG, and each pump click varies a little. The Multiple-Fill Fuel Economy Calculator divides total distance by total fuel, which averages out those swings.
The aggregate method weights each fill by its fuel, which is the correct way to average MPG. A simple average of fill MPG figures gives a different and less accurate answer.
What are the uses of a Multiple-Fill Fuel Economy Calculator?
There are 4 main uses of the Multiple-Fill Fuel Economy Calculator, including stable MPG figures, seasonal comparisons, and fleet reporting.
Get a stable MPG
Average economy across a month or more.
Compare seasons
Compare summer and winter aggregates.
Report fleet economy
Aggregate fuel card data by vehicle.
Handle partial fills
Keep accurate totals when some fills are partial.