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Chat live with AutoWeek executive editor Roger Hart on Friday

AutoWeek executive editor Roger Hart will field your questions at 12:30 p.m. on Friday. Roger just got back from the Amelia Island Concours d'Elegance, and he is editor of the CarLife section of the magazine.

Range Rover Sport (2014) [w/Gallery]

This is the new, second-generation Range Rover Sport, unveiled at the New York Auto Show. While the first Sport – introduced in 2005 – was a tentative toe in the water for a second Range Rover model line, this new model forms the center of a three-model range, between Evoque and full-fat Range. At 4,850mm long it's 62mm longer than the car it replaces but 149mm shorter than the new Range Rover, while its wheelbase has grown by 178mm to increase rear access – particularly important as there's now the provision of a pair of occasional seats in a third row.

Porsche 918 Spyder (2010) at Geneva motor show

Porsche has shown off this stunning new 918 Spyder concept car on the eve of the 2010 Geneva motor show. It’s a mid-engined two-seater in the mould of the Porsche Carrera GT – a landmark supercar to showcase Porsche’s technical nous. Michael Macht, president and chief executive officer of Porsche, unveiled the 918 Spyder in Switzerland, and intriguingly proclaimed that Porsche has never shown a concept car that it hasn’t put into production… Porsche’s official press release was light on the details, but after the unveil Porsche’s R&D chief Wolfgang Durheimer talked CAR around the 918 Spyder and revealed some eye-popping figures for this part-electric hybrid supercar which weighs in at 'less than 1490kg'.