GasBuddy - GasBuddy lets you search for Gas Prices by city, state, zip code, with listings for all cities in the USA and Canada. Updated in real-time, with national average price for gasoline, current trends, and mapping tools.

FindMyCar - FindMyCar is a iPhone application that uses the location services to help you find your car.

Fuelio - Track your fill-ups, fuel consumption, fuel costs and save money.

Pedal App - Breakthrough Smart Car Technology. The leading car app for managing and maintaining your vehicle. Enhance your safety, security and efficiency from the driveway to the highway.

Fuelly - Fuelly allows you to tracks your gas mileage over time, helping you calculate fuel expenses as you drive.

Mileage - A Mileage tracker for an Android-based phone.