The quick math
Total miles are divided by MPG to estimate gallons. Gallons are multiplied by the gas price, then tolls, parking, and other shared costs are added.
Road trip planning
Price the drive before you leave.
Turn trip miles, vehicle MPG, gas price, tolls, and parking into one useful total—and split it fairly.
Enter the trip
Use your route's driving distance and your vehicle's real-world MPG when possible.
Use it as an estimate
Actual fuel use changes with traffic, weather, speed, terrain, idling, cargo, and route changes. MPG and gas prices should reflect the trip you expect to take.