Mileage improving

Two weeks ago, I wrote about the 25% drop in my gas mileage. The good news that in the two week period since then my mileage has improved.

Miles Gallons Miles/Gallon Gallons/100 Miles
192.4 8.133 23.66 4.23

I’d really like to know what happened to the gasoline mix that caused such a drastic drop in efficiency. Big Oil conspiracy? Winter-Summer switchover? Somebody scrubbed the underground tanks and left residue?