Fuel Cost Calculator

How to Use the Fuel Cost Calculator

How to Calculate Fuel Cost Manually

The formula is: Fuel Cost = (Distance ÷ MPG) × Price per Gallon. For a 350-mile trip in a car getting 32 MPG with gas at $3.50/gallon: (350 ÷ 32) × $3.50 = 10.9 gallons × $3.50 = $38.28. In metric: Fuel Cost = (Distance km × L/100km ÷ 100) × Price per Litre. For a 600km trip at 8L/100km with fuel at $1.85/L: (600 × 8 ÷ 100) × $1.85 = 48 litres × $1.85 = $88.80.

Factors That Change Your Real-World Fuel Economy

EPA ratings are measured under controlled conditions and frequently differ from real-world driving. Key factors that reduce fuel economy: highway speeds above 60mph (aerodynamic drag increases exponentially — fuel economy at 75mph is typically 15–20% worse than at 55mph); air conditioning (adds 5–25% fuel consumption depending on conditions); aggressive acceleration and braking (smooth driving saves 10–40%); cold weather (gasoline engines warm up inefficiently — short cold trips in winter can cut MPG in half); tire pressure (under-inflated tires by 10 PSI reduces MPG by approximately 3%). For a realistic trip estimate, reduce your car's rated MPG by 10–20% for highway driving with AC and moderate speeds.

Comparing Trip Costs: Car vs Alternatives

When evaluating driving versus flying or taking the train, fuel cost is only part of the picture. Add parking ($20–$60/day in cities), tolls (I-95 corridor from Boston to DC totals over $40 in tolls), vehicle wear (AAA estimates $0.09–0.12 per mile for tires, oil, and depreciation on a typical car), and driver fatigue for long trips. For trips under 200–300 miles, driving is almost always cheapest and often fastest door-to-door. For 400–700 miles, budget airlines often compete. Above 700 miles, flying total cost is frequently lower than driving when vehicle wear is included.

Fuel Cost by Vehicle Type: What to Expect

Fuel costs vary dramatically across vehicle categories. A compact sedan averaging 35 MPG costs approximately $0.10/mile at $3.50/gallon. A midsize SUV at 25 MPG costs $0.14/mile — 40% more per mile. A full-size pickup truck at 18 MPG reaches $0.19/mile. A hybrid averaging 50 MPG drops to $0.07/mile. Over a 500-mile road trip, the difference between the hybrid and the pickup is over $60 — nearly the cost of a night's accommodation.