Skip the LSD. It offers no advantages to a car built for fuel economy. Also skip any "go fast" parts like aftermarket header (unless you already have it), intake, etc. Put the money where it counts.
You are moving in the right direction with removing excess weight from the car. Since it seems like you know your way around a car, consider swapping in the 1992-1995 Honda Civic CX/VX final drive. The DX tranny is the middle of the road as far as gearing goes. For fuel economy, you want tall gears to lower the RPM at highway speeds. Pump up the tires to at least sidewall max pressure. This is the easiest mod, and one of the most effective.
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