At the 2012 Chicago Auto Show, Volkswagen will reveal the most fuel-efficient version of the new Beetle in the States, the TDI, which is powered by a 2.0-liter four-cylinder diesel engine producing 140 horsepower and 236 lb-ft of peak torque. The same powerplant is offered on the North American Jetta and Passat TDI models. The diesel engine can be mated to either a six-speed manual gearbox or VW