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 - A Farmall Restoration Story - What's Been Done So Far - by Sean Brinston. This is a story of my first real tractor restoration. My name is Sean Brinston and I was 15 almost 16 at the time of this.My neighbour directly across the road who I had helped with hay all the time had this tractor sitiing at his house for what I thought was 6 years. Finally I got the money and courage to ask him. I phoned him and he said it was already sold, eight years ago!
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