I've got a little over 3200 miles on mine, and the EVIC mileage seems to be climbing now that the miles are racking up. I'm around 15 mpg but I do get a little excited with the "happy pedal" as they say. Can't say it's great MPG, but for a near 400hp motor it's reasonable.
I remember reading people with Torque Converter problems noticed a drop in MPG's. Wonder if that's what's going on here.