Weight and drag reduction will satisfy both the go-fast and the fuel economy enthusiast. The most pain-free weight reduction happens behind the front seats.
You'd probably also enjoy an alternator toggle switch and a battery charger.
I'm not sure what your "Tuner" is, but if it re-works the fuel:air ratio map, get rid of it! You get the best fuel economy by keeping RPMs low and the fuel:air mixture lean.
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