Manage BankrollManageBankroll.com

Automotive

Fuel Economy Calculator

Calculate MPG and fuel costs for trips

How to Use

Calculate your vehicle's fuel economy and costs:

  • Miles per gallon (MPG) or kilometers per liter
  • Fuel costs per mile/kilometer
  • Daily, weekly, monthly, and yearly fuel costs
  • Driving range with full tank

How to Use the Fuel Economy Calculator

The Fuel Economy Calculator helps you calculate your vehicle's fuel efficiency (MPG or L/100km) and estimate fuel costs for trips. Track your vehicle's performance and make informed decisions about fuel efficiency.

  1. Calculate miles per gallon (MPG) or liters per 100km (L/100km).
  2. Estimate fuel costs for planned trips.
  3. Compare fuel efficiency between different vehicles.
  4. Track fuel economy over time to identify efficiency changes.
  5. Calculate total trip costs including fuel.

Fuel Economy Formulas

Understanding fuel efficiency calculations helps you budget for trips and identify potential vehicle maintenance issues.

Miles Per Gallon (MPG)

MPG = Total Miles Driven / Gallons Used

MPG measures how many miles your vehicle travels per gallon of fuel.

Example:

Input: Miles driven: 300 miles, Fuel used: 12 gallons

Calculation: 300 ÷ 12

Result: 25 MPG

Liters Per 100km (L/100km)

L/100km = (Liters Used / Kilometers) × 100

European standard for fuel efficiency; lower numbers indicate better efficiency.

Example:

Input: Fuel: 8 liters, Distance: 100 km

Calculation: (8 ÷ 100) × 100

Result: 8 L/100km

Fuel Cost for Trip

Trip Cost = Distance ÷ MPG × Price Per Gallon

Calculates the fuel cost for a planned journey.

Example:

Input: Distance: 300 miles, MPG: 25, Fuel price: $3.50/gallon

Calculation: (300 ÷ 25) × $3.50

Result: $42

MPG to L/100km Conversion

L/100km = 235.2 / MPG

Converts between imperial and metric fuel efficiency measurements.

Example:

Input: MPG: 25

Calculation: 235.2 ÷ 25

Result: 9.4 L/100km

Real-World Use Cases

Fuel economy calculations help with trip planning, vehicle purchasing decisions, and identifying maintenance issues.

Trip Budgeting

Estimate fuel costs before long road trips to plan your budget and identify the most economical routes.

Vehicle Comparison

Compare fuel efficiency between vehicles to make informed purchasing decisions and calculate long-term ownership costs.

Maintenance Monitoring

Track fuel economy over time to identify sudden efficiency drops that may indicate mechanical problems.

Eco-Friendly Driving

Monitor and improve your fuel economy to reduce emissions and environmental impact of your driving.

Business Expense Tracking

Calculate fuel expenses for business vehicle deductions and reimbursement claims.

Tips & Best Practices

Tips

  • Check tire pressure regularly; underinflated tires reduce fuel economy by up to 3%.
  • Combine trips to reduce total distance driven and fuel consumption.
  • Accelerate smoothly and avoid excessive idling to improve fuel efficiency.
  • Remove excess weight from your vehicle; every 100 lbs reduces MPG by about 1%.
  • Highway driving is typically more efficient than city driving for most vehicles.

Common Mistakes to Avoid

  • Not resetting trip odometer when filling up, leading to inaccurate calculations.
  • Comparing city and highway fuel economy without considering driving conditions.
  • Ignoring tire pressure and maintenance factors that significantly affect fuel economy.
  • Using instantaneous fuel economy displays instead of calculating over full tanks.