Jaguar along with Italian design firm Bertone are pulling the covers off two concept cars at this week's Geneva Auto Show. Diesels are making a comeback in the European market where they had been losing market share. Researchers say safety systems in cars need to be specifically engineered to protect obese and older people in crashes. All that and more, plus John compares a Chevy Silverado with a 5.3 liter V-8 versus a Ford F-150 with an EcoBoost V-6.