A few years ago, I found myself comfortably ensconced in the back seat of a German taxicab. I was luxuriating in what I thought was leather (it was MB Tex, the convincing faux hide) when the driver cranked-up the engine. Smoke and stench poured from the Mercedes' diesel engine. I scoffed-- until the driver blew straight through 180kph on the autobahn to Munich. Even from the passenger seat, the torque was more intoxicating than the exhaust wafting in through the window. I was hooked.