Introducing Myself and Expressing My Joy of Hypermiling

If you're interested, here's a fuel-up history for over 130k miles tracked in my Prius:
Long term owners mpg | PriusChat (It doesn't seem like the forum will let me link to Fuelly directly.)

Travelling with the cruise at 65-68 MPH, no hill working and no drafting yields about 46 MPG in winter, and ~50 MPG in summer. This was what I spent most of 2016 and 2017 doing. I would occasionally play around with basic hypermiling which is what resulted in most of the 53+ MPG tanks.

Cruise control set to 75 MPH and actively passing most cars on the road yields low 40's MPG in winter and about 46 MPG in summer. This is what I spent 2018 doing and as you can see it trashed my fuel economy. I only achieved 50 MPG once in all of 2018 and just barely. I believe this was during a heavy traffic anomaly when I simply could not speed for several days.

The trip meter for this tank is showing 54 MPG, so I'm expecting my actual MPG to be 51.x when I calculate it at the pump. Like I said earlier the average for my last 10 tanks is 43 MPG, so this would represent nearly a 20% increase. If I had to guess based on past experience I'd attribute 75% of this simply to slowing down and the remaining 25% to trying to work some of the hills out there.