How are you calibrating / adjusting for water injection AFR?

[Forum Admin]

The injection of water and alcohol mixes in the induction system will dilute the exhaust and alter the partial pressures being measured by wide band lambda sensors.

I have not been able to nail down the exact degree or amount of potential error - though feed back would suggest that a meter would read leaner than the actual induction mix is.

Has anyone calibrated or otherwise adjusted their readings for water injection?