Not a full tank total, but as we are having the first nice day in a good while, I opted to take the Echo on the scenic route to work. Got 51.9mpg! According to my UltraGauge, anyway...I'm still honing the calibration but it should be within a few tenths now.
I think that's a commute record. I like that number so much, I'll post it again: 51.9mpg!!!!