When I was looking at my Soul before ultimately buying it, I had the hood up and the salesman pointed at where it said “GDI” and said, “It’s Gasoline Direct Injection, so you can use regular unleaded, too.” I just said, “Oh, okay.” and left it at that, but I’m still curious... For one, I can use regular gas in addition to what? Pepsi? And two, what the hell sort of engine doesn’t use this “GDI” they’re so proud of? What would the alternative even be? Gasoline Indirect Injection, where it just squirts gas across the engine bay and hopes that it lands in the right place? I regret not asking him to elaborate.