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Founded in 1997, AutoTrader.com is the US's largest online automotive marketplace. Sell your car or shop for one using Autotrader's searchable database of millions of new and used cars from thousands of dealers and private sellers.

Car shopping site. Search for new or used cars for sale in your area (US only), Kelly Blue Book values, payment calculator and an auto news blog.

Look up new and used vehicle prices.

If you are shopping for a new or used car or truck you need to think about fuel economy.  A more efficient vehiche can save you up to $1,400 per year in reduced fuel costs alone..  Plus reducing petroleum consumption is good for the economy and burning less fuel also reduces the emission of greenhouse gases that contribute to global warming.

FuelEconomy.gov was created by the U.S. Department of Energy (DOT) and the Environmental Protection Agency (EPA) to help consumers research the fuel economy of vehicles they are considering buying. The mobile version of the site is especially handy for looking up mileage ratings from the dealer's showroom or used car lot. It lists EPA estimated highway and city miles per gallon for all cars and light trucks sold in the U.S. since 1985.  Listings also include an estimate of annual petroleum use in barrels and carbon footprint in tons of C02 per year. Source: submitted by a reader.

Official U.S. mobile site for Nissan Motors. Specs, photos and prices for all models and a dealer locator. Mobile usability is somewhat lacking with phone numbers that are not click to call and a form for requesting a quote that has way too many required fields. Source Oh! Mobile Directory

Volkswagen of America's attractive mobile site has photos and specs of all VW models, a dealer locator and free ringtones and wallpapers. Source: Oh! Mobile Directory

Looking to buy or sell a used car or motorcycle? If you are in the UK, AutoTrader looks like it would be helpful. It started as one of those free shopper magazines that you find on racks at the supermarket but has expanded to include a website and now a mobile site at autotrader.mobi. The mobile version lets you search a database of over 400,000 vehicles for sale by make, model and postcode. The site is free to use for buyers, no registration is required and listings include the seller's contact information.

To place an ad you will need to visit AutoTrader's full site at autotrader.co.uk Ads are not free. Prices range from £9.99 for a 2 week online-only (including mobile) listing of a vehicle priced under £1000 to £44.00 for a 3 week listing of a more expensive vehicle with the ad appearing simultaneously on the web and in the print magazine.

There's an AutoTrader in the US too. It's under different ownership but uses the same business model as its UK namesake with a free shopper magazine and web and mobile sites at AutoTrader.com and m.autotrader.com respectively

A UK car price guide, based on real cars for sale. Search for cars by make, model, year and accessories. Useful for seeing an idea of the range of prices for given auto.

This site was one of the first to use the <meta name="viewport" ...> tag to reformat a desktop site as a single column for mobile browsers, a technique that became a core element of the responsive web design movement

Mobile edition of a major car shopping site for India.  Photos and specifications of all autos sold in India. Search for new and used autos for sale. Also has a selection of free automotive themed wallpaper downloads. Source: Mobility.mobi

Search 160,000 new and used cars for sale listings on your phone with the mobile edition of carsales.com.au, Australia's largest online motor vehicle sales site. The site also motoring news and car reviews and a used car value estimator. Source: Mobility.mobi