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It sounds like you are looking for a specialty widget and while we do not have anything like that in the Sitebuilder at this time, you may be able to find what you are looking for, or at least something close, by Googling around a bit. I just did a quick search for miles calculator widget and received a number of results that may suit your needs including this widget.
If that doesn't suit your needs I suggest you dig a little deeper or even look at the source code for widgets you've seen on other websites that you like. That will tell you where the widget came from and can help further your search.