The CostToDrive Crew has created a new free road trip planning tool that allows one to calculate the driving cost between two places. The starting & ending places can be identified by zip code or city and state. The application uses mapping and distance algorithms together with the EPA mileage data (all you need to do is enter your car model and year) to calculate the driving cost.
The results also include fuel station locations, flight costs (for comparison shopping) and some other fun stuff.
Check it out here and post some reviews below!
It is similar in ways to RTA's Fuel Cost Calculator -- do you like it better? No matter what, it's a cool application.