Just to add some. This is all true. But, while ACTUAL AFR is not correct for say E10, you can still use AFR, if you're comfortable in AFR.
If the WB displays 12.78, the ACTUAL AFR will be 12.2. So you don't really have to switch to Lambda. And then, just like tuning for most power, fastest acceleration, you're going to have to find the best AFR regardless. E10 may not perform best with a lambda of .78 anyway. It may like .79, it may like .77 for your combo.
The problem arises if the guy is trying to get the WB to read 12.2 because he thinks he has E10. Which may not be exactly that either.
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