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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.

Look up new and used vechicle prices. Navigation is ineffficent on non-Openwave browsers

German high performance and collector car market place.  Browse listings for everything from a $600,000 Mercedes 300SL Gullwing coupes to a $7,000 Porsche 912. Covers Audi, BMW, Mercedes and Porsche. Lot's of nice photos of the cars. Source: Oh! Mobile Directory

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.

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

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

Vehix is a site for car shoppers. The mobile version lets you find new and used cars for sale by zip code with prices and click to call phone numbers. You can also lookup the value of any used car made since 1989. Those features worked well, however digging deeper in the site revealed a lot of non-functioning links. Via: Mike Rowehl - This Is Mobility

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

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 names with a free shopper magazine and a web site (AutoTrader.com) but no mobile presence that I could find. Opportunity lost for AutoTrader.com. Especially as two of it's US competitors are on the mobile web; Vehix Mobile and Cars.com Mobile

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 is an example of using the <meta name="viewport" ...> tag to reformat a desktop site as a single column for mobile browsers (iPhone, WebOS, bada, Android, Opera Mobile and Mini, BlackBerry) that support meta viewport.