Yes, this is a bug, one that you can see more discussion about in another thread. Of course, many of us enjoy tracking our gas mileage, and LoneBPalm posted a terrific spreadsheet for doing so in the post below. (Sorry, I don't know how to link to a post.)
According to my spreadsheet, I've purchased gas 16 times since I picked up my Karma almost 3 years ago, and have a lifetime MPG as of my last fill of 210mpg. I've been as high as 228mpg lifetime and had one tank go for 648 miles. Not bad at all for a beautiful driving machine that people still stop me to ask about.
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Fisker Mileage Calculator