Join the Pump-House Gang

Number of stations

GasBuddy.com About 110,000

✓ GasPriceWatch.com 130,509

Types of gas

GasBuddy.com Regular, medium, premium, and diesel

✓ GasPriceWatch.com Regular, medium, premium, diesel, as well as biodiesel and E85, for the two people who can use it

Info sources

✓ GasBuddy.com 1.8 million registered users; averages 400,000 to 500,000 unique listings per week

GasPriceWatch.com About 156,000 users submitting 200,000 to 400,000 listings per week; listings from gas-station companies

Mapping features

GasBuddy.com View prices at a quick glance over a wide area; displays station amenities; removes listings older than 72 hours.

✓ GasPriceWatch.com Google Maps mashup color-codes listings by freshness; easier to search stations by type of gas and age of data; must zoom in close to see stations.

Mobile features

GasBuddy.com Get info via text messaging or mobile Web site gasbuddytogo.com.

✓ GasPriceWatch.com: Data available in mobile apps such as Mobio (free, getmobio.com) and TeleNav ($10 a month, telenav.com); planning to launch its own in August.

Member benefits

✓ GasBuddy.com Registered users earn points based on how many listings they provide; can win prizes such as $250 in free gas, natch.

GasPriceWatch.com Users earn points … for bragging rights.

Verdict

GasBuddy.com Ugly but efficient. Perfect if gas prices are your favorite icebreaker.

GasPriceWatch.com More aesthetically pleasing for users, but there's less incentive to participate.