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GM continues work on fuel-saving engine technology

Sometime in the next decade, you might be able to enjoy some of the benefits of a diesel without driving one. A technology called HCCI improves fuel economy 15 percent and releases fewer emissions by using a combustion process similar to what is used in diesel powerplants. General Motors continues work on the project, which could be applied across a range of engine sizes and used with other advanced fuel-saving technologies to help the company comply with the proposed new mileage and emissions targets announced Tuesday by President Barack Obama.

Audi Q5 refreshed for 2013, new engines added

For a mid-cycle refresh, Ingolstadt hasn't lavished a whole passel of aesthetic rearrangement upon the Audi Q5. There's some fiddling in the interior, some minor meddling with the face and, really, that's about that. The company did, however, go a bit zany in the engine bay.

Porsche Panamera diesel owners can boost the fun with TechArt power upgrade

The German Porsche tuning haus TechArt revealed a power-upgrade kit for the Porsche Panamera diesel. While the 30-hp bump from the stock 250 horses to 280 won't light the world on fire, the 37-lb-ft jump in torque, from 405 lb-ft to 442 lb-ft, is sure to be a kick in the pants. The 0-to-60-mph time drops by 0.1 second from stock to 6.6 seconds, but the top end is up 3 mph to 153 mph.