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TQ moves a car. Weather that be from rotational inertia or from burning fuel. -- with that in mind, does your list makes sense?
IMO, compression, better fuel and good tune is where you want to be looking. Simply for better MPG's, I don't see any reason to spend thousands for +/- 5 MPG. Especially when it'll take quite a few miles to recoup the money spent vs hum-drum mileage. Financially it doesn't make sense.
Whereas compression can be had by simply having the head shaved (couple hundred at most, complete if DIY) and a tune $400. And I'd bet you'd gain just as much mileage as all the other work you think you should get done.
But you'll find out quickly that weight and aero are where the only real gains in MPG are.
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