everyday ToolUpdated 2026-09-19
Gas Mileage Calculator (MPG)
Calculate your car’s true gas mileage between tank fill-ups to monitor engine health and fuel efficiency.
Formula & Mathematical Methodology
MPG = Miles Driven ÷ Gallons Refilled
Divides odometer trip mileage by the exact gallons required to top off the fuel tank.
How to Use This Gas Mileage Calculator (MPG)
- Reset trip odometer when filling up.
- On your next fill-up, enter the trip miles and gallons pumped.
Step-by-Step Worked Example
Scenario: 340 miles driven, 12.5 gallons pumped
1. 340 ÷ 12.5 = 27.2 MPG
2. Metric equivalent: 235.214 ÷ 27.2 ≈ 8.65 L/100km
Final Calculated Result: 27.2 MPG (8.65 L/100km)
What Does Your Result Mean?
Comparing real-world MPG against EPA window-sticker ratings helps spot maintenance issues early.
Common Practical Applications:
- Vehicle maintenance monitoring (detecting tire underinflation or clogged air filters)
- Fleet fuel tracking
Important Limitations & Assumptions:
- Ensure you fill to the automatic pump click-off at the same station for maximum consistency.
Frequently Asked Questions
What is considered good gas mileage?
Modern passenger sedans typically average 30+ MPG combined, while hybrid vehicles often achieve 45 to 55 MPG.
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