Hmm, Iguana VS. Mammoth.

[adrimid]

Mammoth = 2 PC to upgrade..
Iguana = 9 PC to upgrade..
Both two person mounts that give an increased boost to defense(mammoth), and attack(iguana).
So why the big difference? o.O
(If you say it is not a two person mount I have included an attachment below)

[speeds16]

The move spd of Mammoth is only 230, Iguana has 260, which is as fast as Hellwing. Higher base move spd = more move spd when you feed it.

[adrimid]

Mmm.
Makes sense.
Still a big difference though. ;0

[speeds16]

Try feeding the Hellwing 27 pc's at a time for gaining the same amount of speed :P (and ofc Hellwing also has the stats added more but ssh)