Just been reading (and not able to fully understand all the technicalities) the Euro NCAP Front Impact Testing Protocol
(http://www.euroncap.com/downloads/test_procedures/area_3/event_2/EuroNCAP%20Frontal%20Protocol%204.1.pdf) and have the following observation about the missing 5th star for the Civic:
The civic failed due to the intrusion of the accelerator by 106mm exceeding the limit by 6 mm (If I remember correctly) which is approximately 1/4 inch. The specification quite rightly states the forward/aft position of the drivers seat, the rake of the seat back etc to enable comparisons to be made. Remember the failure was due to the accelerator intruding more then 100mm, I personally tend to drive with the drivers seat quite far back and my legs more stretched out than a lot of other drivers so that 6mm would imagine have less effect in the event of an accident than if I drove with the seat closer to the dash and conversely if the seat was closer with my legs at a different angle more of an effect.