The average age of vehicles on roads in the U.S. increased again last year to 10.8 years. Mercedes-Benz is considering exporting engines built in the U.S. Japanese conversion company, Campinn just unveiled a camper add-on for the Toyota Prius at the Tokyo Auto Salon. All that and more, plus guest host Mark Phelan from the Detroit Free Press shares his hits and misses from this year’s Detroit Auto Show.