Interesting comments!
I too was surprised that it registered that last leg of my trip as a transfer (GPS problems would explain the location error). All in all, while three bucks is three bucks I'd rather have a system that works correctly. First, I'd rather pay my fair fare and have the money go to track maintenance or signal upgrades or whatever. Second, if Presto can undercharge me then Presto can overcharge. However, I'm also glad that PinkLucy states that she's had her card checked after Presto not charging her and she didn't receive a ticket. I can deal with getting dinged an extra $3, but a $300 ticket is another matter. Presto is definitely an interesting game and I'll keep a close eye on my "card activity"!