Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

Volkswagen XL1

Volkswagen chose the Qatar motor show to debut its new XL1 Super Efficient Vehicle. The latest evolution of the SEV niche – that stretches back to the 1-liter concept of 2002 – makes extensive use of lightweight materials and hybrid technologies to offer a reported 313mpg. The car's exterior is a clear evolution of the tandem seat L1 from 2009.

Renault working on 141mpg plug-in hybrid concept

Renault is working on a 141mpg plug-in hybrid concept car to be shown at the 2014 Paris Motor Show, according to Renault head of research, advanced studies and materials, Remi Bastien. Speaking to at Renault’s ‘Innovations’ event last year – showcasing the French manufacturer’s new technology that will underpin its next-generation models – Bastien revealed the new car will make its debut in 2014. On Bing: see pictures of Renaults Find out how much a used Renault costs on Auto Trader This means the ‘2l/100km’ concept car will likely make its first public appearance at Renault’s home Paris Motor Show in October, debuting experimental technology that could later filter down to other models in the Renault range.

2013 SRT Viper packs devilish details

The 640-hp V10, the curvy fenders, heck, even the carbon treatments—there are enough spotlight features on the 2013 SRT Viper to outfit two or three sports cars of lesser pedigree. While the potent engine and the striking design are clearly the signature elements of SRT's macho machine, there are a few subtle design cues lurking inside for sharp-eyed enthusiasts. Let's call them Easter eggs, and they're intricate yet intriguing.