1) GasBuddy
http://www.appolicious.com/tech/apps/505240-gasbuddy-find-cheap-gas-prices-gasbuddy-organization-inc
2) AAA Trip Tik Mobile apps
http://www.appolicious.com/tech/apps/220252-aaa-triptik-mobile-american-automobile-association
3) Waze http://www.appolicious.com/tech/apps/68486-waze-gps-traffic-social-fun-waze
- great features that involve community reporting, providing information taht is more current and reliable
4) Gas Cubby (iPhone)
http://www.appolicious.com/finance/apps/58632-gas-cubby-fuel-economy-mpg-mileage-calculator-and-car-maintenance-service-log-the-application-cubby-llc
5) GasBook: Cheaper Gas Prices, Better Fuel Economy, Gas Station Finder, and Fuel Log All in one
http://www.appolicious.com/tech/apps/190328-gasbook-cheaper-gas-prices-better-fuel-economy-gas-station-finder-and-fuel-log-book-all-in-one-tapmojo-llc
6) Siri Roadtrip
Apple commercial for Siri Roadtrip http://www.youtube.com/watch?v=-UpmQN55q2g
More info at appolicious.com