Trying to up the mpg's on the family cruiser before vacation. I blocked the top half of the grill in about 15 min. I used some old vinyl siding & black duct tape. First I removed the 5 screws at the top of the grill, cut the siding to fit inside. Taped the front of the siding & screwed them in with the 5 screws. The botton of the grill blocks fit infront of the clips holding the grill in, which helps keep them in place. There is a photo in my garage, Grand Green Caravan.