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The concept car has always been a mainstay of the car manufacturers in pouring new ideas. Which is the best car in 2012? As we prepare to welcome the year 2013, it is timely to review the best concept cars of 2012 in various categories. From the shape supercar, green-cars, to cars and odd abstract form. Quoted from GizMag, here's 10 best concept car in 2012: 1. Sexiest Roadster: Lamborghini Aventador J Lamborghini Aventador J If there is one concept car that can radiate sexiness in every curve of her body is only one name that can be done, Lamborghini Aventador J. 2. Coolest off-roader: Mercedes-Benz Ener-G-Force Mercedes-Benz Ener-G-Force   Like the G-Class, hydrogen-fueled cars are designed to be through any road muddy, rocky, or hilly roads slippery. Equipment in it also includes several useful tools such as scanners and terrain scanner toolbox. 3. Most Radical Supercar Design: Peugeot Onyx Peugeot Onyx Many other supercar concept looks monotonous, so it...