Haven't really done much at all to it, except for a new intake and extractors.
Had it down to 5.1L per 100k on the highway, so 46MPG. In the city it's around 7.7L per 100k, so 30.5MPG. So both figures are better than the EPA rating. Oh and being in Australia a lot of the highway driving is with aircon So if I did without I'd imagine I'd be more efficient.