dosimatr's thread got me thinking a bit.
I'm going to fill up tomorrow (it's premature - I still have over 1/2 tank) in order to try a new challenge. I'm going to try to hypermile without ANY reliance on my speedo or tach. I may even put a piece of paper over both gauges so that I have no choice but to ignore them entirely.
My goal is to improve the precision of my ear to engine connection. Sure, I can do that already, but not with precision.
Additionally, I figure this will do two other things: make commuting more relaxing, and put my focus back on creating bigger buffers as opposed to opting for higher gears prematurely (and then braking).
Lately, I've been disappointed as I try to get to higher gears before traffic is ready. It's a poor habit. I figure that if I can take the "perfect is the enemy of the good" (that's Voltaire, I think) philosophy and apply it to hypermiling, I'll perform better in traffic and be a better driver overall.
This is my challenge. My goal is to meet or exceed 23.5 mpg in this manner. If any other EM'ers are interested, you are welcome to give this challenge a shot. I'll post back in a few weeks with single tank results.