Fuel Economy Improvement
Use the Fuel Economy Improvement. Enter Old fuel economy and New fuel economy for a clear result, formula explanation, and practical planning checks.
Fuel Economy Improvement measurements
Enter your values, then calculate.
Result
How to calculate fuel economy improvement
This calculator finds fuel economy improvement percentage by comparing old and new fuel economy figures.
How the calculation works
Improvement = ((New MPG − Old MPG) ÷ Old MPG) × 100.
Example
Old 22 MPG, new 28 MPG: ((28−22)÷22)×100 ≈ 27.3%.
Frequently asked questions
How is Result calculated?
Result = ([New fuel economy] − [Old fuel economy]) ÷ [Old fuel economy] × 100.
Is the Fuel Economy Improvement free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Fuel Economy Improvement
Improvement = ((New MPG − Old MPG) ÷ Old MPG) × 100.
Let's understand your fuel economy improvement result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Fuel Economy Improvement
- Use consistent measurement conditions (similar routes, driving style) for both old and new figures to isolate the true improvement.
- A negative result means fuel economy actually declined, not improved.
Common Fuel Economy Improvement Mistakes to Avoid
- Comparing MPG measured under very different driving conditions (highway vs. city) as if they reflect a genuine efficiency change.
When to Use This Calculator
This calculator finds fuel economy improvement percentage by comparing old and new fuel economy figures.