Very interesting to find someone else who is also perplexed by the double keys. I've thought about this as well and I arrived at a different conclusion. My guess is car rental companies give you two keys in case one doesn't work. Maybe one fob is out of battery or one of the keys doesn't work. Having a hot stand-by is much cheaper than having to rescue you from a distant location.
Huh. I can't remember the last time I didn't get either one key, or the second key was a valet key. That's _quite_ a nitpick.
Wow, <i>this</i> is a trivial first world problem.
Yes evil...we live in a first-world country, for now.