Been using a vivfit for a week now, and there is a problem with "12 month mileage" in vivofit user's profiles.
Here's mine:
In a week, I clearly didn't do this many miles!
What's fairly constant is that "<steps> * 0.81" is displayed as miles. The mileage numbers on the garmen connect mobile Android App seem correct, and this only happens with garmenconnect.com