I'd start out with the 100+ hypermiling tips. I'm sure you can get better than 24 mpg with a few alterations to your driving style. I know a coworker who had the same car and routinely got 27ish and he was by far not a conservative driver.
As for mods, I'd probably try to start out with something other than aero since you are doing pretty good in that area already. That being said I'd probably still block off the top slot in the bumper. Anyway, what I am getting at is I would look into a warm air intake for it. Since its automatic you'll be doing more driving with load. So, if the engine can handle a bit warmer air you'll see some benefits there. Have you pumped up your tires yet?
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