E85 is 85% ethanol alcohol, and 15% gasoline.
On another note, I was able to separate out the 15% gasoline yesterday by adding about 50% water to E85. The water mixed with the alcohol and the gasoline rose to the top in a clear layer. This is similar to the method used to determine if there is ethanol in regular pump gas, which is to add water to the gas and see if the level of water/alcohol rises higher after a few minutes. I was surprised to find no ethanol in some regular pump gas I bought here in Colorado. I figured it would have 10% ethanol in it but evidently the grade I bought, 85 octane, had no alcohol in it. I'm going to start testing all my fuels to figure out what exactly I'm getting. I just need a few graduated cylinders. -Tom