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How much time is spent on the highway vs in town driving? This should dictate where you expend your efforts. If you do a lot of stop and go, then reduce the weight. If you spend a lot of time driving fast, then reduce aero drag.
You have a lot of room in that engine bay and I wonder if you could easily retrofit a turbo. There has been some interesting discussion of turbo charging a car for efficiency, but I still have my suspicions that you would be doing well to even maintain your current MPG.
All of your ideas sound easy and cheap enough to me, and I'd be curious to see your results.
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