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if your still under warranty take it in and let honda figure out there headaches.
first off modern cars have a slosh module that basicly just averages the level readings against time to give a fairly accurate fuel level. thus the reason the guage moves up slowly after filling.
i know for gm and the corvette your slosh module was in two peices, a sending card in the right tank (the tank is spilt around the torque tube with a transfer pump in the left tank and the fuel pump in the right) and the actual software calibration in the BCM. for a while we were updating every corvette with a guage problem with an updated calibration that took care of guages that were off or moved around too much. on occasion we would find one where the sending card was fualty so it got replaced. now thats a 50k flagship car and yours is a commuter vehcile, so i doubt it has seperate sender formt he pump, however i am willing to bet the slosh module calibrations are updatable in ne of the cars computers. it maybe worth your while to call the dalership and talk to one of their drivability techs.
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