I don't have an iPad/iPhone I could use, but I did find this app:
https://itunes.apple.com/us/app/tolls-calculator-usa-canada/id909952082?mt=8
I estimated gas for round-trip to be about $250, but I can't figure out how to estimate the toll cost (I'm going from Rutland VT to the Stennis Space Center in MS) Any help is greatly appreciated!
Read more:
How much would tolls cost from Vermont to Mississippi?