UA: LAX-EWR-MIA 3.3cpm Jan-Mar 2016
 

It looks like United Airlines has some good fares for anyone looking for an early 2016 mileage run.

Same day turns can be done on the LAX-IAH-MIA-ORD-LAX route for $228 or 4.3cpm (distance is 5,284 miles per GCM).

But, if you're happy doing an overnight stop, you can route via EWR in both directions for $234 and a total distance of 7,079 giving you 3.3cpm.

Fares are available for travel January - March 2016 (most cheap fares are in January) and I can't see any onerous restrictions. Flight times aren't too bad either with no through-the-night flights needed.

All fares found via ITA Matrix so you should be able to replicate the results there. I've reproduced screenshots of the availability shown by Matrix in a blog here.

I already snagged one for January.

I'm considering doing it twice.

I can't do those brutally long runs at my advanced age of 51.