The most loaded it is, the most dead weight you have to haul around. Working around an AC clutch to disable the power-steering at highway seems to be a good way to save some fuel when you're driving while your partner won't feel so bothered about a full power-steering delete. Light-colored cloth interior trims are also a good option since they tend to absorb less heat from sunlight exposure, so it would allow you to use the AC less. Regarding aerodynamics, a cheap and easy source of slight improvements would be replacing the external mirrors with smaller ones used in sports motorcycles.
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