KIA. "KILLED IN ACTION" and cousin to Hyundai. Dodge owned by FIAT, GM by the Govt Motors, Fisker subsidized Govt-Car for the wealthy Obama supporters, Basically the H3 is a Brick with wheels efficiency was not in the original plan, Plugs, performance filter, Synthetic oil (Which is already used originally except engine), maybe Nitrogen in the tires, taller rims less rubber is good idea, Electric fan would help and problaby pcm upgrade. Can't see much else. oh, I would go with a Ford Cmax or Fiesta if you want good gas mileage. Hummer is just that niche vehicle either you love em or hate em.