Not Ranked
Some EFI system use lamda (?) instead of AFR, which is AFR/14.7 so that 1.0 is the ideal AFR. In this case, 1.1 is lean and 0.9 is rich.
Others use the inverse, so that an increasing number is richer. You need to get specific information from the manual of your ECU. Then you need to read some books on tuning EFI to try to understand what the manual is talking about.
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