Japanese carmakers Honda and Toyota will display their eco-friendly concept cars at this month’s 2009 Tokyo Motor Show. Green technology and fuel efficiency will take center stage on the stands of most automakers at the show. … The Honda Skydeck concept will debut at the Tokyo auto show and uses a hybrid powertrain and seats six people. It makes use of both sliding and scissor-wing doors. Honda, which has concentrated on hydrogen fuel cell vehicles as the greenest …