Uneven Tire Wear

I was checking the tire pressure the other day when I noticed a very distinct tire wear pattern.

The two front tires are worn on the inside AND outside edges. The tread is almost entirely gone. The middle is showing normal wear as in it looks fine.
The two rear tires have even wear and look relatively fine.
My initial thought was that this is indicative to the wear pattern someone would expect if they ran their tires low. I do not run low and I check regularly.

Then I had another thought. Could it be the high-speed turns (aka "death turns") common to some hypermilers? There are times when I do not brake much - if at all - when making turns. For the most part, I decelerate/coast to the speed at which I normally turn (18-20mph for right turns and 22-24mph for left turns). There are other times, however, when I can choose between turning faster or stopping for traffic and I choose to turn fast.

These are the OEM tires that came with Priapus four years ago. I plan on replacing them before winter. But I would like to know if my next set would fall victim to the same fate if it's caused by my driving style.

 

Well, N3FOL, when I say that I check them regularly, I intentionally didn't say what I check for. I'm currently running 52f/50r. Most people tell me that running high will cause the tire to bulge and wear on the inside of the tire. To that I say, "look at this!"

The tires are just a hair under 48,000 miles old.

 

You are correct on the rotation aspect. I have never rotated these tires. In fact, I've never knowingly rotated any tires on any car I've every owned. Just haven't. But this is really starting to get me thinking that I should move these front ones to the rear.

Here is a picture of the front left. You tell me if this is bad.