Fuel Economy
Compute real-world MPG and the cost per mile of driving.
About Fuel Economy
Miles divided by gallons gives real economy, which converts into liters per hundred kilometers and the cost per mile. Real-world economy usually trails the sticker, so measuring it shows actual fuel expense and driving habits' impact.
Formula
Fuel Economy
MPG = miles / gallons; L/100km = 235.215 / MPG
- 235.215
- Conversion between MPG and L/100km
Worked example
With the default values below, Fuel Economy returns Fuel Economy of 27.8. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Miles drivenminimum 0.1 mi
- 320 mi
- Gallons usedminimum 0.01 gal
- 11.5 gal
- Fuel priceminimum 0
- 3.45
Results
- Fuel Economy
- 27.8 mpg
- Fuel Consumption
- 8.5 L/100km
- Fuel Cost
- $39.68
- Cost per Mile
- 0.124 $/mi
Step by step
- 1Values used
- 2Fuel Economy
- 3Fuel Economy= 27.8 mpg
- 4Fuel Consumption= 8.5 L/100km
- 5Fuel Cost= 39.68
- 6Cost per Mile= $0.124/mi
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Fuel Economy calculated?
MPG = miles / gallons; L/100km = 235.215 / MPG Miles divided by gallons gives real economy, which converts into liters per hundred kilometers and the cost per mile.
Why does Fuel Economy matter?
Real-world economy usually trails the sticker, so measuring it shows actual fuel expense and driving habits' impact.
What values do I need to enter?
This calculator takes 3 inputs: Miles driven, Gallons used, Fuel price. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.