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So, I picked up a Veepeak OBD II reader for $17 and paid $10 for the Fusion App.
I must say, it is really quite fun to track my trips with.
I have it tracking the obvious things like speed, rpms, acceleration, etc, but also so fun things like altitude change, coolant temp, and engine power.
It's no Durametric but it can tell me I haven't thrown any codes, which is nice.
Here's a shot of today's trip. Also, my speedo reads about 4 mph faster than true speed - 94 reading is really 90.