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About This Calculator
This calculator estimates the total fuel expense for a trip based on distance, your vehicle's fuel efficiency, and the current price per gallon or liter. It helps compare the cost of driving versus flying or taking public transit for any given journey. Fleet managers use fuel cost calculations to optimize routing, justify vehicle upgrades, and budget accurately for operational transportation expenses.
Quick Tips
- 1 Highway driving at 55 mph uses 15-20% less fuel than driving at 70 mph.
- 2 Divide trip distance by your MPG, then multiply by fuel price per gallon.
- 3 Underinflated tires by 10 PSI can increase fuel consumption by 3-5%.
Example Calculation
450-mile road trip, car gets 28 MPG, gas at $3.45/gallon.
Fuel needed: 16.07 gallons | Trip cost: $55.45 | Cost per mile: $0.123
How Fuel Cost Is Calculated
Fuel cost equals the distance divided by your fuel efficiency (MPG), multiplied by the price per gallon. For example, a 300-mile trip at 25 MPG with gas at $3.50/gallon costs 12 gallons x $3.50 = $42.00.
Improving Your Fuel Efficiency
Maintain proper tire pressure, remove excess weight, use cruise control on highways, avoid aggressive acceleration, and keep your engine tuned. These habits can improve fuel efficiency by 10% to 30%, saving hundreds of dollars annually.
Comparing Fuel Costs Between Vehicles
Use this calculator to compare trip costs between vehicles with different MPG ratings. A vehicle getting 35 MPG will cost about 30% less in fuel than one getting 25 MPG over the same distance.
Road Trip Budgeting
For road trips, calculate fuel cost for each leg of the journey separately if gas prices vary by region. Add 10% to 15% for detours, city driving, and stops. Factor in fuel costs when comparing driving versus flying.
Frequently Asked Questions
Check your vehicle owner manual, the sticker on the driver-side door jamb, or fueleconomy.gov. You can also calculate actual MPG by filling your tank, driving normally, then dividing miles driven by gallons used at the next fill-up.
Use highway MPG for interstate travel and city MPG for urban driving. For mixed trips, use the combined MPG rating. Most EPA ratings list all three values for each vehicle.
Fuel efficiency drops significantly above 50 mph. Each 5 mph over 50 is roughly equivalent to paying an additional $0.20 per gallon. Driving at 65 mph instead of 75 mph can improve fuel economy by 15% to 20%.
Use the fuel grade recommended in your owner manual. Most cars run fine on regular (87 octane). Using premium when regular is specified wastes money with no benefit. Only high-performance engines require premium fuel.