1337, you are already reaching the end of the thether as far as weight reduction is concerned. Even then, seeing your ~2400 lb, 1.6 manual vehicle, the FE figure is nothing to talk about. This means you are leaning excessively on your car for FE and not on yourself. I bet even with some of EOC, you could easily get 40+ MPG. Just have a look at PaleMelanesian's vehicle - all stock, netting him 50+ MPG most of the time.
Seriously, reducing weight further is going to take functional elements of the car out, and would rather harm than help you - its not worth taking the headrest out, for example - It is not there to rest your head, it is to help avoid snapping your neck if some jerk rear-ends you at speed while tooling along the highway.
Maybe I am missing some context but this is what comes to mind when looking at the thread.
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