"Normal driving" for me often is associated with high revs.
The engine developed a tick which I had noticed earlier in the day, which concerned me a lot. My plan was to get the car to the dealership to have it looked at the next day. The tick may have been there longer, but I'd been driving with the stereo cranked up, so I might not have noticed.
I did work the engine up and down a little, to see where the ticking got worse, and where it disappeared, since it seemed to go away at higher RPMs. Most likely, it was just out of my range of hearing, or whatever, rather than actually being gone. This was probably a stupid thing for me to do.
As I was driving home the night that the engine blew (about 11:30pm), the ticking got worse quickly, becoming more of a knock, followed by what I can only describe as someone emptying their toolboox into my engine, a final bang, then a seized engine. I wasn't on a section of road that I could immediately pull over on, or I would have stopped before it got so bad. My only consolation is that the repairs immediately prior to blowing the engine would have most likely involved nearly as much in labor and parts as it was post-boom.
My guess is that I was driving the engine damaged for a day, or maybe two, from previous maneuvers at high revs. I actually find myself in that situation pretty often, getting on or off the highway, etc.
I'm trying to take this whole experience postiviely. I'm going to learn a lot by doing a 3L swap, or even just replacing with another 2.5L, if it comes to that. I'm also hoping to get into a better maintenance routine for my car, and will be keeping up to date on these forums to learn a little bit each day.
I often learn best by learning the hard way. So, I'd better damn well learn a lot from this.