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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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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