If your engine doesn't ping or knock increasing the octane will NOT make a significant difference in your performance or engine life, despite what your ”butt dyno” tells you.
In an objective test of different fuels from pump gas both regular and premium to specialty “race” fuels the Motor Trend show Engine Masters proved there was basically no difference in power (+- 2hp which interestingly might explain the LX LC power diff)
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The link if you want to see the full test
Engine Masters Octane Test
This hasn't been true for most toyotas I've own. It's true at least for the nissan and American brands that I've owned. Toyota tunes are too conservative and retard timing. This has been my experience with most toyotas I've own, from my old rav4 to my ISF. They all have benefited from running higher octane. This is also highly dependent on your location as well. I haven't tested the LX but plan to do so eventually.