Auto Trans Speed Sensor Dorman 917-601 on 2040-parts.com

One Lap of the Web: Mercedes-Benz SLC rendered, Google Glass for the Tesla S and a rusty Datsun 280ZX

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. -- Last month we brought you some intriguing spy photos of a Porsche 911-fighting Mercedes-Benz coupe -- possibly to be called the SLC, or even the next SLS AMG (it's all a bit unclear at this point) -- but layers of camouflage made it a bit tough to see what the car will look like.

Petrol sales '25% lower than 2008'

Petrol sales have plunged in the first half of this year – but diesel sales have risen sharply. Retail petrol sales for the period January to June dipped 5.8% compared with the same period last year, Government figures highlighted by the AA showed. The numbers amount to a fall of 512 million litres.

The most expensive Ferrari ever sold at auction

A new record price was set at Pebble Beach this weekend when the 1967 Ferrari 275 GTB/4*S NART Spider pictured here became the most expensive Ferrari ever sold at auction. That isn’t the same as saying it’s the most expensive Ferrari ever, but the NART Spider is an extraordinarily special piece of Prancing Horse history. Join us as we explore what makes this particular car so important, and take a closer look at one of the most valuable cars in the world.