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Estimate gallons used by dividing trip distance by your vehicle's fuel economy in miles per gallon. Multiply estimated gallons by the expected price per gallon to calculate fuel cost.
Traffic, terrain, weather, speed, idling, and vehicle load can all affect actual fuel economy. For long trips, consider testing a lower MPG scenario to budget conservatively.
Example: A 300-mile trip at 25 MPG uses about 12 gallons. At $3.50 per gallon, the estimated fuel expense is $42.
Illustrative calculations are estimates, not financial advice.