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Chevrolet is bringing CNG power to the Silverado HD

Chevrolet is taking CNG-powered vehicles seriously, with so many of their trucks being used in commercial fleets, so it was perhaps no surprise that we'd see a version of the 2015 Silverado HD that can be run either on gasoline or compressed natural gas before long. Chevrolet brought the 2015 Silverado 2500 HD CNG to the Chicago Auto Show, to let prospective buyers as well as the media to learn about at the savings that could be realized with this environmentally friendly setup. The HD CNG truck will offer bi-fuel capability coupled with its 6.0-liter V8 engine that's been modified with hardened valves and valve seats to run on compressed natural gas.

The complete idiot's guide to drag racing

First, get yourself a car. A 550-hp dragster will do nicely. Sure, you could run what you brung, but a Miata's stock 1.8-liter would look mighty silly making a pass, and we don't have all day anyway.

Lotus V8: the new engine plan in full

Lotus has confirmed details for its new inhouse V8 engine family, which will make its first road car appearance in the 2013 Esprit. Responding to feedback which said the 'New Era' plan to launch five new models was weakened by its reliance on Toyota engines, the new management team decided last Christmas to design and develop its own engine. 'The feedback from customers was "how can you justify a £100,000 car with a Toyota engine?",' said chief executive Dany Bahar.