Thanks for the response, I appreciate it.
My sensor reads 5% different (more) than what the actual content is.
So when running Ethanol free (and confirmed with a kit) my sensor registered 5% not zero. This caused my commanded AFR to be around 14.25 (following the stoich table [ECM12300] as it should) instead of the 14.67822 as should have been commanded by the same table (and I'm sure it would have if the sensor reported Zero).
I adjusted [ECM12300] to command 14.6 when my sensor reads 5% ethanol content (actual content is zero, but sensor won't go lower than 5%).
I hope I'm explaining this correctly.
My commanded AFR is now what it should with the offset I put into the table regardless of what the sensor reports.
E-0 commands 14.6
E-10 commands 14.1
I'm going to test some higher percentages to see if the offset is linear
So when I run across someone with a sensor fitted vehicle I ask if the have verified their sensor.
If most people have no error with ethanol free, I'll replace my sensor