Air bag

My owner’s manual makes no mention at all of the seat distance from the front. abxx

You don’t say.

You should have kept this in your original thread.
Anyway, apparently I was wrong about your Owner’s Manual giving you some guidance on this issue.

However, as tardis pointed out in your other thread, the air bag is supposed to make contact with both your face and your chest, as that is the way that it prevents you from contacting non-yielding surfaces.

If you take a look at the site for NHTSA, that may provide more explanation regarding minimum safe distances from the steering wheel.