Hi David,
There's not a straightforward way to do that now, unfortunately,
although I see why that'd be useful. You could create a "page" in the
top-right drop-down menu, and select the "total logged over time"
module. That doesn't take into account tags though.
Another way you could try it is instead of "miles" in your message,
you could use the category. This isn't as intuitive, but you would be
able to see to breakdowns in the stacked area chart. For example,
instead of using hashtags, you could try:
d yfd rode 10 fixie-exercise
d yfd rode 10 trek-leisure
Then the unit of "miles" would just be assumed.
Nathan