Caravan 208B EX Glide ratio What is the glide ratio for the new EX Cessna 208B with 8750 amphibian floats?
You would have to ask someone in the engineering dept at Wipline for an actual number info@wipaire.com. 

I have enough float time to be willing to stick my neck out and make a somewhat educated guess. I recall from somewhere that the Caravan on wheels with a feathered prop has a really good L/D by single engine airplane standards, somewhere around 12.

Based on personal experience the glide of most seaplanes is pretty brick-like; I would say a good ballpark would be about a 1/3 to 1/2 reduction in L/D from the land plane.  So for a 208 on amphibs I'm guessing it's going to be between 6 and 8.  If you find out hard data from Wipline, let us know the actual number so I can find out how far off I am.

Fortunately, the PT-6 is so reliable the risk of a power off glide from the engine letting you down is pretty tiny.