Anyone know the formula for Spirit regen?

[Gregorius]

Found an interesting thread on official forums stating that a Warrior with alternate Spirit gear could actually regen FASTER than eating food...I found it pretty hard to believe, even with his seemingly accurate numbers. I thought I'd get a second opinion here. ^_^

Basically looking for the formula for Spirit regen, can't find it on the official site (maybe I'm not looking hard enough?) Anyone happen to know what it is?
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Since I mostly visit the Priest forum on the main site, and they mostly care about mana, I don't know. For mana it's approximately 3 Spirit/1 mana per tick. (I've heard this many times and it sounds pretty accurate, and looks like it too) However, on my priest and druid mana regenerates faster than health. So I don't know.

However food doesn't heal *that* fast either...If you got a lot of SPI gear then you could save a fortune on food, combining large Spirit with food, so using lower level food!