Free Fuel Economy Calculator - Calculate MPG & Gas Costs
Calculate your vehicle's fuel economy in MPG, fuel cost per mile, and estimate trip costs.
Formula & Methodology
Calculates your vehicle's actual fuel efficiency based on real-world distance and fuel consumption, allowing you to project future trip costs.
- MPG = Total Miles / Gallons Used
- Cost per Mile = Gas Price / MPG
Worked Example
Using the Fuel Economy Calculator: apply the formula above to your input values. For instance, MPG = Total Miles / Gallons Used, then Cost per Mile = Gas Price / MPG. The tool performs each step instantly and shows the result.
Frequently Asked Questions
How is fuel economy calculated?
It divides distance travelled by fuel used, giving miles per gallon or litres per 100 km depending on your units.
What is the difference between MPG and L/100km?
MPG measures distance per unit of fuel (higher is better), while L/100km measures fuel per distance (lower is better).
How can I improve my fuel economy?
Smooth driving, correct tyre pressure, less idling and reducing excess weight all raise real-world efficiency.