Here's the crucial difference between Target and car dealers - Target can use Facebook's ROAS (return on ad spend) algorithm to optimize dynamic catalog campaigns to generate the highest ROI.
Since car dealers aren't an e-commerce business, we are relegated to using Facebook's other optimization strategies (content views for example) that don't always translate into sales.
And I'm sure Target is still segmenting their catalog across product categories, among many other attributes, to really tailor their ads and generate demand where they see fit.