Break-Even Fuel Savings Calculator
Find out how many kilometres until a more fuel-efficient car pays back its higher price through fuel savings.
Break-Even Calculator
Price premium vs fuel savings → payback
How It Works
The annual fuel saving is the difference in per-km fuel cost multiplied by annual distance. Break-even distance is simply the price premium divided by the per-km saving.
How to Use This Calculator
- Enter the extra cost of the more efficient car versus the baseline.
- Enter both cars' fuel economies (L/100km).
- Enter current fuel price per litre.
- Enter your annual driving distance.
- Click Calculate — see annual saving and how many years to break even.
Worked Example
Reference Table
| Fuel Saving (L/100km) | @ $1.50/L, 15k km | @ $1.80/L, 15k km | @ $2.00/L, 15k km |
|---|---|---|---|
| 1 L/100km | $225/yr | $270/yr | $300/yr |
| 2 L/100km | $450/yr | $540/yr | $600/yr |
| 3 L/100km | $675/yr | $810/yr | $900/yr |
| 5 L/100km | $1,125/yr | $1,350/yr | $1,500/yr |
| 7 L/100km | $1,575/yr | $1,890/yr | $2,100/yr |
Frequently Asked Questions
Does the break-even calculation account for the time value of money?
This is a simple payback calculation, not a discounted cash flow analysis. Money saved in year 4 is worth slightly less than money spent today. For a more rigorous NPV analysis, use a spreadsheet — but for most car decisions, simple payback is sufficient.
What if fuel prices change during the payback period?
Use a conservative fuel price (today's price or a slight premium). The break-even point is sensitive to fuel prices — check the result with both current and a 10% higher price to understand the range.
Should I include the financing cost of the price premium?
If you're financing the additional cost, add the interest to the premium. E.g., a $3 000 premium at 6% over 5 years costs $480 extra in interest — making the effective premium $3 480.
What if the efficient car also has higher insurance or registration costs?
Subtract any additional running costs from the annual fuel saving to get the net saving. If the efficient car costs $200 more per year to insure, reduce the annual saving by $200 before calculating break-even.
