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I tried outdoor biking on my electric bike and it was hilarious the absurd number of calories it suggested I burned.
(You still peddle on my bike, it just adds more power to your peddling)
 
Update: Maybe the phone gets smarter. It looks like it didn't count quite so many calories on my drive home tonight. I left work at exactly midnight, and it looks like maybe 30 or so got counted on the way back. That's much closer to reality than 100, which is about what I got counted for on a 20-minute indoor bike ride. So perhaps it's just an early bug from the software learning about your movements and such.
 
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