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One Lap of the Web: Model S carbon footprints, 911 road trips and the Rover 3500

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. -- It's Tesla Model S owner vs.

Ferrari 458 Challenge revealed

The Ferrari 458 Challenge It seems Ferrari had a bit of an issue when they decided they wanted to take the 458 Italia racing – it was just so good in standard form. So instead of giving the 458 Italia more power, they concentrated on making the 458 lighter and tighter to create the Ferrari 458 Challenge, unveiled this week in Bologna. The 458 Challenge gets exactly the same 562 horses out of its 4.5 litre V8 as the Italia.

Mercedes GLA 45 AMG Concept teased (video)

Mercedes GLA 45 AMG Concept teased This was a surprise – the Mercedes GLA 45 AMG Concept. With Mercedes take on a compact SUV with the new GLA revealed at Frankfurt in September, we’d expected Mercedes would put the 4WD power plant from the A 45 AMG and CLA 45 AMG under the skin of the new GLA to make a very hot compact SUV. But we hadn’t expected it yet.