For whatever reason, the alternator delete circuit stopped working the other day. I am guessing it's probably a bad solder joint since it's acting like it an open circuit and charging at 15V. The thing has just been flopping around in my center console for weeks now.
So today's commute was done with the alternator on. I put the fuse back in place of my circuit. It was abnormally light traffic so I was able to push the mileage pretty high. 65 mpg was the result. My guess is if I had the delete working that it would be nearly 70 mpg though.