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Tool: Fuel Cost Calculator (2026) — Trip Gas Cost, MPG & Distance Estimator | Printed on:
Fuel Cost Calculator (2026) — Trip Gas Cost, MPG & Distance Estimator
Calculate road trip fuel costs, total gallons needed, and cost per mile.
Trip & Mileage Specifications
Trip Fuel Cost Formula
Transparent mathematical methodology explained in plain English.
Total Cost = (Distance / Fuel Economy) × Fuel Price per Unit Divides trip distance by vehicle efficiency and multiplies by price per gallon or liter.
Variables Explained:
- Distance: Miles or kilometers traveled.
- Fuel Economy: MPG (miles per gallon) or L/100km.
450-Mile Road Trip at 28 MPG with $3.45/Gallon Gas
Estimating travel budget.
- Gallons consumed: 450 / 28 = 16.07 gallons.
- Total fuel cost: 16.07 × $3.45 = $55.44.
- Cost per mile: $55.44 / 450 = $0.123 per mile.
Frequently Asked Questions: Fuel Cost Calculator
Click any question below to expand quick answers, formulas, and expert tips.
How do I calculate fuel cost for a road trip?
Divide your total trip distance by your vehicle's average fuel economy (MPG), then multiply the gallons needed by the local price per gallon. For example, 450 miles at 30 MPG equals 15 gallons, costing $52.50 at $3.50/gallon.
How do I calculate fuel cost per mile?
Divide the price per gallon by your vehicle's MPG rating. If gas costs $3.60/gallon and your car gets 30 MPG, your fuel cost is $0.12 per mile ($3.60 / 30).
What is the difference between US MPG and UK Imperial MPG?
A UK Imperial gallon (4.546 liters) is roughly 20% larger than a US liquid gallon (3.785 liters). Consequently, a car rated at 30 US MPG delivers approximately 36 UK Imperial MPG.
How do you convert L/100km to US MPG?
Divide 235.215 by the L/100km figure. For example, an 8.0 L/100km vehicle achieves 235.215 / 8.0 = 29.4 US MPG.
How can I improve my car's gas mileage on long highway trips?
Maintain steady speeds between 55–65 MPH, utilize cruise control, keep tires inflated to recommended PSI, remove excess cargo weight, and avoid rapid acceleration.
How much does vehicle air conditioning affect gas mileage?
Running vehicle A/C on maximum power in hot weather can reduce fuel economy by 5% to 15% in city stop-and-go driving. At highway speeds above 55 MPH, using A/C is typically more aerodynamic than driving with open windows.
How do I split gas costs fairly among passengers?
Calculate the total trip fuel cost, then divide the amount equally by the number of travelers. For multi-leg trips where passengers join or exit at different stops, divide fuel costs proportionally by individual miles traveled.
Does premium gasoline provide better gas mileage than regular?
If your vehicle manufacturer recommends or requires premium high-octane fuel, regular gas can decrease fuel economy and power. However, if your car is calibrated for regular 87 octane, premium gas offers no noticeable MPG or horsepower boost.