I use my Karma as my daily driver. Being retired, I don't have a regular commute, so my miles driven per day varies widely. On average, I exceed my 30-35 mile battery range about twice per week, so my mpg for 4800 miles is 46.3
Even with paying $.20/kwh, my cost per mile including gas and electricity is $.17. That compares to $.36 in my 06 M5 and $.25 in my 08 Lexus 600hL. This is true apples-to-apples, since all 3 vehicles were operated with the same heavy right foot.
I've attached the spreadsheet where I keep track of this for those of you who are into detail.