The storage report is generated from  a model .  The model has an error trap about  as large as the "miss".   The  "miss"  is not really a miss,  it is the difference between the EIA model and the  analyst's expectations number which  is a messy,  unreliable average of  guesses and models from whoever gets to throw their wag at DJ or Reuters.   Furthermore, Rob has said several times that the data is not as reliable at this time of year.