Add the distances for each leg of your journey to calculate the total fuel cost.
Estimated total fuel cost for the journey in USD.
Total Distance = Sum of distances for all legs
Fuel Needed (gallons) = Total Distance ÷ Fuel Efficiency
Total Cost = Fuel Needed × Fuel Price
For a journey with legs of 200 miles and 300 miles, fuel efficiency of 25 MPG, and fuel price of $3.50 per gallon:
Total Distance = 200 + 300 = 500 miles
Fuel Needed = 500 ÷ 25 = 20 gallons
Total Cost = 20 × $3.50 = $70