x27 :D
My multiplier is now about where it was before the change over to iMG. Good thing too, since I bought way to many energy tank upgrades and I need the coins to stay a happy little Glitch ^_^
I'm at 15.3x. Mine doesn't seem to add up with the actual upgrades I purchased, though, so I had wondered what sort of multiplier additions come from leveling....
Basically the amount you get from a normal coin, which has a base value of 1, will be the same as your multiplier other than img coins which are 20% higher with full mood. The higher value coins vary considerably.
The biggest coin I have personally gotten was an imagination coin for over 4000. My mult is right around 60.