What is an IP issue?

After the rebuild, we changed the oil every 5,000 miles, and she didn't use a drop between oil changes. Then, after the 2nd oil change (10,000 miles) it went through a quart of oil in about 200 miles. No oil leaks to speak of.

The smoking and burning oil has always been intermittant, it runs well for a large chunk of the drive.

But like I said, last time we took her out, there seemed to be a direct connection between burning oil and facing downhill.