Long tail SEO is one of the easiest ways to draw traffic to your site. Long tail search terms are very specific search terms. In automotive I would describe them as "Used Red f-150 in Seattle" or "Hyundai Sonata w/nav near Jacksonville". Real easy to rank for but hard to define.
A real life example where long tail searches influenced my buying activity is where I need to replace a laptop keyboards for two l laptops. I did a search for "replacement keyboard laptop model#" and found exactly what I was looking for right away ordered them and they will be here tomorrow. The site that had one also had the other. A win win for me. I spent less for two replacement keyboards than I was getting prices for one.
Longtail will get buyers in that are looking for something specifically that you may have in stock. Take advantage of it.