George, I'm pretty sure distilled water is de-ionized. But there are other ways to make de-ionized water besides distillation, notably reverse osmosis, so I think 'de-ionized' is just a generic term for what we usually call 'distilled' water. Distillation is a particular process, but it takes a lot of energy so reverse osmosis is preferred for industrial-scale production of de-ionized water.
As for what's special about Toyota antifreeze, the main thing is the additive package. Old-school antifreeze used what we now call 'non-organic' corrosion inhibitors. (Remember the Prestone ads that touted their 'silicone-silicate' formula?) Non-Organic Additive Technology, or NOAT for short. NOAT antifreeze has pretty much gone by the wayside in favor of Organic Additive Technology (OAT) antifreeze. Dex-Cool is an example of OAT, and I believe all the US manufacturers specify OAT antifreeze.
The European and Japanese manufacturers have each come up with their own variations on OAT antifreeze that combine OAT and NOAT additives, so they're called Hybrid Organic Additive Techology (HOAT). The European antifreeze contains silicates is called Si-HOAT. The Japanese version contains phosphates, so it's called P-HOAT.
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