To calculate the cost of gas for your trip, you must calculate the Local Price per Gallon x (1/MPG of the Vehicle) x Total Distance Traveled, per vehicle. Gas Buddy is a great website that will calculate this for you! After using Gas Buddy to find the cost of gas per vehicle, typing up an expense sheet that summarizes total cost of gas for each vehicle being taken is very helpful.

http://www.gasbuddy.com/Trip_Calculator.aspx

 

Summary of Gas Costs Supporting Document