The upcoming Auto Show in Geneva will be host to amazing surprises and Bentley is one of those trying to get us excited. They’ve been silently working on a luxurious Biofuel Supercar, the marque’s fastest, most powerful production car yet. Based on the 600HP Continental GT Speed, rumors have it that under the hood there’s an ethanol-guzzler version of a twin-turbo W12 engine with an increased mileage and less emissions. Visually we can’t see more changes than the pair of vents on hood, the sizable vertical intakes or the blacked out grille. Aggressive like a feline … isn’t it?