I once had an online buddy by that name. He pronounced it, e-MEAL/e-MILL. It was the first time I had heard of that name, I don't think I had a Oh, Wow! Cool name type reaction. But I do think it is a bit refreshing.
Just to add, I think the first time I saw his name, I thought it was pronounced, Emily. So maybe you can take that thought into consideration.
I think it's pronounce like Ee-meal or Ee-mill but I'm not sure. I think it's ok but I wouldn't use it.
In french it is pronounced ay-MEEL. It isn't that uncommon where I live. I like it, but it definitely would work better in a french speaking community.
I pronounce it the French way as uselesskitty described. I like this name. I also like the Spanish Emilio.
I like Emil and considered it for my top ten. I think of the children's author Emil Kaestner.
Emil - Eh-meel. I wouldn't know what to do with the extra -e and would assume it's silent sort of like in Theodor/e.
If the extra letter is neither here not there for you I'd consider nixing it - in many languages that have genders assigned to words it will be pronounced and could give Emil a very feminine sound. (I can only speak with certainty about German but by adding the e it sounds oddly feminine).