Elhanan wrote...
FYI - It is also a XP bonus at some lvls, I believe; was when I started in the OC and outdistanced my pet badger. And when I saw his little buffed self fell a dragon (ie; got the killing attack), I knew it was worth it!
That is not the way it works. XP "bonuses" in the OC are usually attributed to the ECL scaling effect as sometimes overcompensating for the level gained. Try testing outside the OC where there is no ECL and where the data is more measurable. What you have done is caused the party size to decrease from being too far away from you animal companion. The XP is then calculated as a party of 1, or as if you by yourself killed the creature. Party-size penalty never comes as a bonus.