This is the fourth AutoblogGreen video round up and we've got three more videos from the Frankfurt Motor Show. The above video takes a look at the Opel Flextreme with program manager Frank Weber. Frank says the production version of the car will have the lowest rolling resistance tires ever (they do look very smooth). These types of tires improve fuel efficiency but some think they are not very safe. The above video also includes a look at the Nissan Mixim and asks why they say it's 99 percent evil, 1 percent cute. Below the fold is a video of the Mini Clubman. The video of the Clubman includes a demonstration of the stop and go fuel saving technology. Also below the fold is the Ford Verve concept which may be the next Ford Fiesta.