How to use: Calculate total fuel cost for a trip based on distance, vehicle efficiency, and gas prices. Enter Distance in Miles or Kilometers. Enter Fuel Efficiency (MPG - miles per gallon your vehicle gets, typically 15-40 MPG). Enter Fuel Price per Gallon (current gas price, typically $3-$5). Results show: Fuel Needed (gallons required), Total Cost (trip fuel expense), and Cost per Mile ($/mile). Example: 300-mile trip in 25 MPG car with $3.50/gallon gas = 12 gallons needed = $42 total = $0.14/mile. Used for: road trip budgeting, commute cost analysis, delivery route costing, and comparing vehicle operating expenses. Higher MPG = lower costs. Essential for transportation planning and expense tracking.