It is the voltage that makes the rpm's drop so low.....I have the same problem at idle and I put in a voltage gauge on my pillar and when the voltage drops to around 12 at idle, I can see the rpm's drop low too......I told the dealer about this problem and they said it was normal.......so I don't know....it seems to be a problem with most hondas (not only tegs)

 

mine idles at about 750 when warm

 

thats not right. my car idled at 750 pretty much all of the time. but the voltage never dropped below 13.8 which is where it is supposed to stay. if it just 12 volts, the it seems as though your alternator or voltage regulator are dying.

 

700-800 rpms