Gas Mileage Calculator
Gas Mileage Results
Efficiency Analysis
Environmental Impact
About the Gas Mileage Calculator
The Gas Mileage Calculator determines your vehicle's fuel efficiency by calculating miles per gallon (MPG) based on the distance traveled and fuel consumed. This tool helps you monitor your vehicle's performance, optimize fuel consumption, and make informed decisions about vehicle maintenance and driving habits.
Formulas Used
Miles Per Gallon (MPG)
Where:
- Miles Driven = Total distance traveled
- Gallons Used = Fuel consumed during the trip
Cost per Mile
CO₂ Emissions per Mile
Based on 19.6 lbs CO₂ per gallon of gasoline
Step-by-step Working
Step 1: Record Starting Mileage
Note your vehicle's odometer reading when filling up the tank.
Step 2: Drive and Refuel
Drive normally until you need to refuel, then fill up completely.
Step 3: Calculate Distance
Subtract the starting mileage from the ending mileage to get miles driven.
Step 4: Apply MPG Formula
Divide the miles driven by the gallons used to get your MPG.
How to Use
Enter the total miles driven since your last fill-up
Input the number of gallons used to refill your tank
Click "Calculate MPG" to get your fuel efficiency results
Review your efficiency rating and environmental impact
Examples
Example 1: Highway Driving
Input: 450 miles driven, 15 gallons used
Calculation: 450 ÷ 15 = 30 MPG
Context: Good highway fuel efficiency for most vehicles
Example 2: City Driving
Input: 200 miles driven, 12 gallons used
Calculation: 200 ÷ 12 = 16.7 MPG
Context: Typical city driving with stop-and-go traffic
Interpretation
MPG Value: Your vehicle's fuel efficiency - higher is better for both cost and environment.
Efficiency Rating: How your vehicle compares to average standards (Excellent: 40+ MPG, Good: 25-40 MPG, Fair: 20-25 MPG, Poor: <20 MPG).
Cost per Mile: How much fuel costs per mile driven - useful for budgeting and trip planning.
Environmental Impact: CO₂ emissions per mile and annually, helping you understand your carbon footprint.
Frequently Asked Questions
How often should I calculate my MPG?
Calculate MPG every few fill-ups to monitor your vehicle's performance and detect potential issues early.
What affects my vehicle's MPG?
Driving habits, vehicle maintenance, traffic conditions, weather, cargo weight, and tire pressure all impact fuel efficiency.
Is highway or city driving more efficient?
Highway driving is typically more efficient due to steady speeds, while city driving involves frequent stops and starts.
How can I improve my MPG?
Maintain steady speeds, keep tires properly inflated, reduce excess weight, get regular maintenance, and avoid aggressive driving.
Applications & Use Cases
Vehicle Maintenance
Monitor engine performance, detect issues early, schedule maintenance
Budget Planning
Calculate fuel costs, compare vehicle efficiency, plan travel budgets
Environmental Tracking
Monitor carbon footprint, compare eco-friendly options
Vehicle Comparison
Compare different vehicles, evaluate purchase decisions
Limitations
Measurement Accuracy
Results depend on accurate odometer readings and complete fuel tank fills.
Driving Conditions
MPG varies significantly based on driving conditions, weather, and traffic.
Sample Size
Single calculations may not represent overall efficiency; track over multiple fill-ups.
Popular Calculators
Percentage Calculator
Calculate percentages, increases, and decreases
Loan Calculator
Calculate loan payments and interest
BMI Calculator
Calculate your Body Mass Index
Grade Calculator
Calculate your grades and GPA
Mortgage Calculator
Calculate mortgage payments
Age Calculator
Calculate your exact age
Fraction Calculator
Add, subtract, multiply fractions
Compound Interest Calculator
Calculate compound interest
Time Calculator
Add, subtract time durations
Calorie Calculator
Calculate daily calorie needs