My folks save their change - the quarters get dumped into an old yogurt container, with lid, for when they travel. There are a couple of toll roads in Houston that make it much faster to get to my sister's house (SE near Johnson Space Center) - although they don't need to drive down one to get to my house (outside the inner toll ring on the SW side of Houston).
It also comes in handy in the car for ice cream cones at McDonald's during their usual summer fifty cent "sale".
The rest of the change gets used so that they can pay with the exact change, whenever possible......it's a family quirk, what can I say. I like doing it, too.