Cost to Drive

Cost to Drive http://www.costtodrive.com/

A driving cost calculator which uses google maps to get a distance, Opis to get the cheapest gas prices on the route, and fueleconomy.gov to find out out your car's gas mileage. It looked to me like it underestimated gas prices (and ignored wear and tear), but it would be a useful system as compared to other methods of transit.

Gas Prices: http://www.opisnet.com/
Fuel Economy http://www.fueleconomy.gov/