Thanks for the replies.

I am going to consider improper installation as the most likely cause unless I can find an issue with teeth being damaged or bent.

I am eliminating riding style as I don't ride that bike any differently than my others. I have over 11,000 miles on my touring bike and have never broken a chain on it -- it's current chain has over 4,100 miles. And as I said, I have never had a chain break on any other bike than this Felt.

While I do in fact haul my bikes on a bumper rack, I load them with the drive train away, so there is nothing to rub against the chain. (good suggestion though) And again, it is only the Felt that has issues.