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Gas Mileage Calculator

Calculate your car's fuel economy

Fuel Economy

25.0 MPG

Cost per Mile

$0

Annual Cost

$1,680

Rating

Average

Units
$
MPG

25.0

Efficiency Rating

Average

Cost per Mile

$0

Cost per 100 Miles

$14

Annual Fuel Cost

$1,680

Cost Breakdown

Cost per Mile$0
Cost per 100 Miles$14
Annual Fuel Cost$1,680

Frequently Asked Questions

Q

How do you calculate gas mileage?

Gas mileage (MPG) = Miles Driven ÷ Gallons Used. For example, if you drive 300 miles and use 12 gallons, your MPG = 300 ÷ 12 = 25 MPG.

Q

What is good gas mileage?

Good gas mileage depends on vehicle type: Economy cars: 30-40 MPG, Midsize cars: 25-35 MPG, SUVs: 20-30 MPG, Trucks: 15-25 MPG. Hybrids and electric vehicles achieve 40+ MPG equivalent.

Q

How can I improve my gas mileage?

To improve MPG: 1) Maintain proper tire pressure, 2) Drive at steady speeds, 3) Avoid aggressive acceleration/braking, 4) Remove excess weight, 5) Use cruise control on highways, 6) Keep vehicle well-maintained, 7) Reduce idling time.

Q

What affects gas mileage?

Factors affecting MPG include: driving habits (aggressive vs smooth), vehicle maintenance, tire pressure, vehicle weight, aerodynamics, speed (optimal 50-60 mph), air conditioning use, and road conditions.

Example Calculations

1300 Miles on 12 Gallons

Inputs

Distance300 miles
Fuel Used12 gallons
Gas Price$3.50/gallon
Annual Distance12,000 miles

Result

Fuel Economy25.0 MPG
Efficiency RatingAverage
Cost per Mile$0.14
Cost per 100 Miles$14
Annual Fuel Cost$1,680

MPG = 300 / 12 = 25.0 MPG (Average rating). Cost per mile = $3.50 / 25 = $0.14. Annual cost = (12,000 / 25) x $3.50 = 480 x $3.50 = $1,680.

2450 Miles on 10 Gallons (Efficient Sedan)

Inputs

Distance450 miles
Fuel Used10 gallons
Gas Price$3.50/gallon
Annual Distance15,000 miles

Result

Fuel Economy45.0 MPG
Efficiency RatingExcellent
Cost per Mile$0.08
Cost per 100 Miles$8
Annual Fuel Cost$1,167

MPG = 450 / 10 = 45.0 MPG (Excellent rating, 40+ MPG). Cost per mile = $3.50 / 45 = $0.078. Annual cost = (15,000 / 45) x $3.50 = 333.3 x $3.50 = $1,167.

Formulas Used

Miles per Gallon (MPG)

MPG = Distance (miles) / Fuel Used (gallons)

Calculates fuel economy by dividing miles driven by gallons consumed.

Where:

Distance= Miles driven between fill-ups
Fuel Used= Gallons of fuel consumed

Cost per Mile

Cost per Mile = Gas Price / MPG

Fuel cost for each mile driven.

Where:

Gas Price= Price per gallon of fuel
MPG= Calculated fuel economy

Annual Fuel Cost

Annual Cost = (Annual Miles / MPG) x Gas Price

Estimated yearly fuel expense based on driving distance and fuel economy.

Where:

Annual Miles= Estimated miles driven per year
MPG= Vehicle fuel economy
Gas Price= Price per gallon of fuel

Understanding Gas Mileage

Gas mileage (MPG) measures how far you can drive on one gallon of fuel.

Better MPG saves money and reduces environmental impact.

Driving habits and vehicle maintenance significantly impact fuel economy.

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Last Updated: Feb 12, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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