Suppose thats not so bad then. I find trio to be the most fun (12 kill trips, < 4min kills, hardly any food used) but duo isn't much slower so its probably more money overall.
I do 2 kills/trip, however I use a shield on the smoke/ice phases (and Zaros if the food is low). However I did manage to do a 3 kill solo trip yesterday. No idea how that happened.
@ Finbarr & rocktail - When you die your familiar will "die" / vanish. I think if it manages to "die" on top of your gravestone, all the items inside it will appear on your gravestone. It's the only explanation I can think of.