Easy and cheap mods would be covering the dash with something insulating and reflective. A couple hundred would buy you good, metalized, heat-rejecting tint. It might be fairly easy to insulate your ducting into the cabin (be careful of the airbags!). More pricey would be to repaint part or all of the car with at least a brighter paint but perhaps even some of that new ($$$) heat rejecting paint (not available in a good black yet). Sheepskin seat covers are serving me pretty well too.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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