Just an Update:
Day 2.5 of the 500 mile tank challenge. Everything is going pretty good so far, sadly I had to make a trip to go look at a car on a significantly less economic route as per my usual. But I was still able to maintain an average of 32.2 for the 160 miles so far for this tank.
Hoping with my home commute today I can bring the average up a tad. Been doing some mild neutral coasting to the stop signs and trying to keep it around 55mph(my route is mainly back country roads).
So far so good! On track to hit my 500 mile goal with ease. Time will tell! Cold weather here has made it hard with most mornings in the 30's. Great for performance, bad for mpg haha.