It would be very simple to create an app. for I-phone/I-pod touch and Android that would give not only the general info you are talking about, but some pretty handy diagnostics about the bike's performance. It could even create a logbook just like divers' computers, so you could compare performance in different roads, terrains, altitudes, inclinations, weather conditions, etc.
And, if someone goes wild enough, it could also have an option to send all that data to a website where other geeks and Brammo's staff could analyze and compare different bikes and figure out what people are doing with mods. in order to tell which ones improve performance and which ones hinder performance.
A good programmer, a Brammo technician, and an experienced "all conditions" rider could create this whole thing in a couple of weeks.