I think it would be interesting to have an app that determines the optimal times to stop for gas during a trip. Especially when you are traveling across state l

I think it would be interesting to have an app that determines the optimal times to stop for gas during a trip. Especially when you are traveling across state lines, gas prices can vary a pretty decent amount. The simple version: - Once you're under a certain amount of fuel (1/3 of a tank?), you open the app, and tell it you need to get gas within the next n miles. The app checks gas prices along your route (does gasbuddy have an api?), and tells you which gas station you should stop at. The complex version: - The app connects to your car with an OBDII device via bluetooth (they are pretty cheap), automatically watches how much gas you have left, and determines the optimal place to refuel once you are under 1/3 of a tank. Basically, you would be able to open the app at the start of your trip, and it would alert you a few miles before the best exit to get gas.