Pace, remember a Seneca is not a transport category certified aircraft and therefore has different performance specs. I certainly hope that Citations are certified according to FAR/JAR 25, but as i dont fly them i don't know if that is the case.
We used that thing (seneca V) during training but shortly after i was done my flight school got rid of it due to very poor dispatch reliability and safety concerns (around 40% dispatch reliability). We flew it to full airline procedures, however we knew that there is a certain range during take off where an engine failure is not really survivable if you use balanced field length.