Long story short (on my end) is I purchased an electronic E85 tester and it reads a consistent 7% low as compared with my manual test tube. The electronic tester manufacturer says throw the manual in the trash, after seeing the below I say throw the electronic in the trash. In short, electronic's see anything other than gasoline as ethanol, they're not actually sensing ethanol! They are sniffing for gasoline and reporting everything (including water) else as ethanol! The vid below shows a bucket of water being tested as E100 because there is 0 gasoline present!
https://m.youtube.com/watch?v=8DZhLjwsWVY&client=mv-google
https://m.youtube.com/watch?v=8DZhLjwsWVY&client=mv-google