Floyd,
Agreed on the "Fix-a-flat." Although I don't use it casually, since it can make a bit of a mess inside the tire (for whomever does fix it), I will use it in certain situations, where changing a tire might be dangerous (place or time).
I carry a small tire patch (plug) kit, too. I used a friend's kit once a few years ago when I had driven over a screw and had a slow leak. I was able to remove the screw and fit the plug (on the car) without even causing the tire to lose much air. Took me back to one of my first jobs, at a gas station

I had completely forgotten that you could just plug your own tire (certain holes, anyway) until a friend reminded me; after that I got my own kit to carry.
I hadn't had an actual on-the-road flat in ages, until last year when I had a blowout on one of my rear tires. Luckily I was only going about 25mph and was not towing. Unluckily, I had not checked my spare for air in much too long a time

Luckily, a gas station was only a quarter mile away, and I had been able to pull off the road into a church parking lot. So I simply got some practice jacking the car up, and rolling a tire while I walked

Hey, it was nice to have the spare be a bit smaller and lighter! (Mine is a mini-spare, but it's a biggish mini-spare).
I called the tire place (Tire Rack) because they were "good" tires, and not more than a year or two old (about 15,000 miles on them). They said that sometimes these just happen, and it could have been from driving over something. But they did also mention that if you drive with too little air pressure in your tires, that the belts can kind of start to rearrange themselves, and that can lead to a blowout. Anyway, I got two new rear tires just to be safe for towing. Now I have a really nice spare at home

Raya