Free fuel cost tool
Fuel Cost Calculator — Trip, Monthly & Yearly Fuel Cost
Calculate fuel cost per trip, per month and per year — compare two cars, and see exactly what better MPG saves you.
Calculate Your Fuel Costs
One car — or compare two side by side.
How to Calculate Fuel Cost
Fuel cost = (miles ÷ MPG) × gas price. A 40-mile round trip in a 28 MPG car at $3.40/gal costs $4.86. Drive it 250 days a year and that’s $1,214 — fuel is the most visible running cost, and small MPG differences compound fast.
What 10 Extra MPG Really Saves
Going from 25 to 35 MPG on 12,000 miles/year at $3.40/gal saves $582/year — every year you own the car. Over 8 years that’s $4,650, often more than the hybrid premium that bought the efficiency.
Cut Your Fuel Bill Without a New Car
- Slow down: 75 mph uses ~20% more fuel than 65 mph.
- Keep tires at spec pressure; remove roof racks when unused.
- Combine errands — cold starts are the thirstiest miles.
- Use cruise control and coast to red lights instead of braking late.
Frequently Asked Questions
How much does it cost to drive 100 miles?
At 28 MPG and $3.40/gal: (100 ÷ 28) × $3.40 = $12.14. Use the calculator above with your own numbers.
How do I calculate monthly fuel cost?
Monthly miles ÷ MPG × gas price. 1,000 miles/month at 28 MPG and $3.40 = $121/month.
Is a hybrid worth it for fuel savings?
Often yes if you drive a lot: 12,000 miles/year, 25→45 MPG at $3.40 saves ~$900/year. Divide the hybrid premium by yearly savings for your payback period.
Does AC use a lot of gas?
About 5–10% extra in city driving, less on the highway. At highway speeds, AC beats open windows (drag).
Why do gas prices vary so much by state?
State taxes (up to $0.60+/gal difference), refinery proximity, and regional fuel blends. California and Hawaii are typically priciest.
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