We drive the VW XL1 - world’s most economical car - on the streets of Doha to see what it feels like to return 313mpg.

On Tuesday, at its Intel Developer Forum (IDF), in San Francisco, the company revealed further details of Nehalem, a more power-efficient chip architecture that will be at the heart of many future products. Intel disclosed power-saving features that promise to let servers, desktop, and laptops run faster without needing more power. Turbo is back :)