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Paid closer attention this time to the voltages - the converter does indeed keep the voltages above 13V and up to (at least so far) 14.8V - it appears to depend on the SOC of the 12V battery but even a fully charged battery is going to always get a float charge from the converter.
With each state change (like the brakes being applied etc) usually causes a slight correction in voltages (goes from 13.0 to 13.1 back to 13.0 back to 13.2 etc...)
Could explain why a battery with a bad cell can really mess up your mileage. The Prius would always be dumping 14.8V into the system thougth your battery would still start the electronics fine - which means a lot of your traction battery would get drained frequently causing the ICE to come on more often.
again - just a theory that seems to fit the facts.
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