Fuel Cost Calculator

Yes significantly. Fuel efficiency typically peaks around 45–55 mph. At highway speeds above 65 mph, aerodynamic drag increases fuel consumption substantially — every 5 mph over 50 mph can reduce fuel economy by 7–14%. Aggressive acceleration and hard braking also reduce MPG considerably.

Use the MPG rating that best matches your driving conditions. For mostly highway driving, use highway MPG. For city driving, use city MPG. For mixed driving, the combined MPG estimate (a weighted average of about 55% highway and 45% city) is most accurate. Your vehicle's actual performance may vary by 20–30% from EPA estimates depending on driving habits.

Several strategies reduce fuel costs: maintain proper tire pressure (underinflation increases fuel use by up to 3%), use cruise control on highways, remove excess weight from the vehicle, avoid idling for extended periods, keep up with engine maintenance (clean air filters, fresh spark plugs), and plan routes to avoid heavy traffic. Consider carpooling or combining errands to reduce total miles driven.

This calculator is designed for gasoline vehicles. Electric vehicles are measured in miles per kWh (or kWh per 100 miles), and cost is calculated using electricity rates in dollars per kWh rather than fuel prices per gallon. For EVs, use a dedicated electric vehicle cost calculator that accounts for your local electricity rate and the car's energy efficiency.

Cost per mile is useful for several reasons: it enables direct vehicle cost comparisons regardless of trip length, it is used for business mileage reimbursement calculations, and it helps evaluate whether a more fuel-efficient vehicle would justify its higher purchase price over time. Simply multiply cost per mile by annual miles driven to see yearly fuel expenditure for any scenario.