Mazda brings diesel back to Indy with 6 Skyactiv-D

Diesel has enjoyed great success lately as a racing fuel, but there's one place it hasn't appeared for more than six decades: Indianapolis Motor Speedway. Mazda's breaking that dry spell this weekend, when its Mazda 6 Skyactiv-D race car will head to Indy for the Grand-Am race. We like the 6 in both road trim and racing livery, but that previous diesel-powered racer -- the Cummins Diesel Special -- is pretty neat too.

Bonneville broadcast will add pepper to the salt

If you've ever been to Bonneville during Speed Week, you know what a thrilling corner of the motorsports world the place occupies: standing out on the endless, blazing-white expanse of salt, hearing the cars before you see them, seeing first the roostertail of salt rocketed into the air, then the tallest part of the rear fin, then the car itself, blasting over the curvature of the Earth, followed by engine cutoff, popping chutes, deceleration and the giddy celebration of driver and crew as yet another record falls. But most people -- those with jobs, kids, responsibilities (where are your priorities, people???) -- will never get a chance to go. So this year, the Southern California Timing Association has made a deal to broadcast audio of the entire Speed Week live, as it happens, direct from the salt, on the fabulous internet.

Daihatsu Deca Deca concept

The Deca Deca concept was one of three concept cars unveiled by Daihatsu at the recent Tokyo motor show and one of the stars. Called a 'super box' by its maker, the Deca Deca's robust exterior form expresses stability. But beneath the car's boxy exterior proportions and upright stance is a modern, reconfigurable interior that emphasizes functionality.