Redesigning the top-selling vehicle in America is already fraught with peril. But taking a big leap in materials and engines is another thing altogether. We discuss the new 2015 Ford F150 pickup and the impact of its aluminium body and downsized engines. Ford's EcoBoost 2.7-liter turbo V6 might be half the size of rival truck engines, but with 325 hp and 375 lbft of torque in a 5,060 pound truck, it sure doesn't feel like it. We also answer viewer questions about upscale sedans, including the Volvo S60 and Buick Regal.