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MPG Calculator
Your Fuel Efficiency
0 MPG
km per liter
0 km/L
liters per 100km
0 L/100km
Efficiency Rating
Poor Average Excellent
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How to Calculate Your MPG
- Fill your tank completely
- Reset your trip odometer to zero
- Drive normally until you need to refuel
- Fill up again and note gallons added
- Enter miles driven and gallons used above
Tips to Improve Your MPG
- Maintain proper tire pressure - Underinflated tires reduce MPG by up to 3%
- Avoid aggressive driving - Rapid acceleration wastes fuel
- Use cruise control - Maintains steady speed on highways
- Reduce idling - Turn off engine for stops over 30 seconds
- Remove excess weight - Every 100 lbs reduces MPG by 1%
- Keep up with maintenance - Clean air filters and fresh oil help
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Frequently Asked Questions
How do I calculate my car's MPG?
Fill your tank, reset your trip odometer, drive normally, then fill up again. Divide the miles driven by gallons added. That's your real-world MPG.
Why is my actual MPG lower than the EPA rating?
EPA ratings are tested under ideal conditions. Real-world factors like city driving, weather, cargo, tire pressure, and driving style can reduce MPG by 10-30%.
What affects fuel efficiency?
Speed (optimal is 45-65 mph), acceleration habits, tire pressure, air conditioning, cargo weight, road conditions, and maintenance all impact MPG.
How do I convert MPG to L/100km?
Divide 235.215 by your MPG. For example, 30 MPG = 235.215 ÷ 30 = 7.84 L/100km.