If you need support from Yola please contact us via firstname.lastname@example.org or make use of our live chat service! We are working on a new approach to community-based support and during this transition period we are not adding any new threads to this forum. Many thanks to everyone who has participated over the years and we look forward to unveiling a new peer-to-peer support system soon!
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.