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One Lap of the Web: Elon Musk's Hyperloop, Greenwich Concours and a Model T

We spend a lot of time on the Internet -- pretty much whenever we're not driving, writing about or working on cars. Since there's more out there than we'd ever be able to cover, here's our daily digest of car stuff on the Web you may not otherwise have heard about. The 2013 Porsche Rennsport Australia went off over Memorial Day weekend at Sydney Motorsports Park and motorsportretro.com has full gallery of pictures.

Mazda 3 five-door (2008): the first photos

By Tim Pollard First Official Pictures 25 November 2008 09:43 Mazda has issued five photographs of its new 3 hatchback ahead of its debut at next week's Bologna motor show. The five-door, announced today, follows hot on the heels of the Mazda 3 four-door saloon unveiled at last week's 2008 Los Angeles Auto Show.Few firm details have been released today, but Mazda claims the engines will be more efficient, the kerbweight lighter and 'the world's first catalyst to be constructed using single nanotechnology.' Apparently this cat uses significantly fewer rare materials such as platinum and palladium than regular filters.The new 3 will have a new range-topping 2.2-litre turbodiesel, developing 183bhp or 148bhp. Both are EU5 compliant and are cleaner and more powerful than the current 2.0 TD.

918 Alert! Porsche's stinging spyder grows closer to becoming reality

The first fully road-going prototype of Porsche's upcoming 202-mph hybrid-powered 918 Spyder has been seen during shakedown runs at the company's R&D center in Germany. Porsche released its own lightly disguised photographs of the cars being tested. The mules are “camouflaged” in livery meant to summon the famous 917 racer.