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

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.

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

ARBA Drivers Club - ARBA Drivers Club is a powerful tool for managing car maintenance, fuel consumption (MPG), tracking income and expenses. Unlimited vehicles, EV & Hybrids.

Pit Stop - Search for gas prices and deals at gas stations closest to you.

My Cars - My Cars is an Android application to manage cars/vehicles expenses.