Filled it up again.

This time, it got all the way down to where the one box on the fuel indicator was blinking at me, and only about 345 miles. I figure it was the much colder weather that we had. Oddly enough, the pump kicked off at only 7.89 gallons, less than the eight-point that I got last time, with the fuel indicator at one box not blinky. Final figures, this tank 43.4 mpg; overall 46.2 mpg, a bit down from the 49 I got last tank. Still quite respectable. This time, I filled with regular (87 octane, (R+M)/2 method); we'll see what happens over the next four hundred miles.