Update:

As of pulling into work this morning, I am getting a 18.6 average fuel economy. That's actually slightly better than previous tankfuls. So far so good.

I did make a discovery, if I set the cruise at 65 I get a steady state(flat ground) reading from the instant economy gauge of 20-21MPG, if I set the cruise at 60, I get steady state of 23-24MPG. I hate going that slow, but the fuel economy is better. I'll just keep the cruise at 65 as going 60 is too painful.