Ignoring the lead content for a moment, the main other difference between avgas and mogas is that avgas has a much lower vapor pressure. That's necessary to prevent vapor lock at high altitude. A side effect of the lower vapor pressure is that it has a much longer shelf life than mogas. I imagine the long shelf life is why your fire department is using it in their small engines.
Now as far as the lead goes, the so-called "low lead" avgas has a LOT of lead in it. It's called "low lead" only because it has less lead than the aviation fuels that it replaced. Newer engines are designed to run unleaded fuel, which is not to say that they won't run just fine on avgas, but you probably won't get the manufacturer's blessing to do so.
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