When to use this calculator
A lower consumption figure creates a larger monetary saving when either total distance or fuel price rises.
Explore the fuel use & cost calculators for other questions in this topic. For a related calculation, use the Fuel Range Calculator: Estimate range from usable fuel and average consumption.
PUTTING IT INTO PRACTICE
Fuel Cost Savings: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Distance (km) | 1,000 |
| Old consumption (L/100 km) | 8 |
| New consumption (L/100 km) | 6 |
| Price per litre | 1.5 |
| Result | 30 currency units |
- Check the input labels and enter the example values above.
- Apply the relationship: Savings = distance × (old consumption − new consumption) × price/100.
- The result is 30 currency units, rounded for display.
How to interpret your result
Uses one fuel price for both scenarios and ignores costs of making the change.
State the fuel-economy convention: UK imperial and US liquid gallons have different volumes. L/100 km is consumption, so lower values indicate less fuel used per distance. Input prices are scenario values.
Frequently asked questions
Are UK MPG and US MPG comparable without conversion?
No. Both use miles but different gallon volumes, so their numerical values differ for the same vehicle consumption.
When is the fuel cost savings calculator useful?
A lower consumption figure creates a larger monetary saving when either total distance or fuel price rises.
How do I use the fuel cost savings calculator?
Enter distance (km), old consumption (l/100 km), new consumption (l/100 km), price per litre. The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Savings = distance × (old consumption − new consumption) × price/100.
What should I check before using the result?
Uses one fuel price for both scenarios and ignores costs of making the change.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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