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Maybe, but it's quite a bit wider. Check for rubbing very carefully.
Yes, you can mount 225-60r16 tires on a rim made for 215-65r16 tires.
No, this is not an acceptable swap.
Yes , that is suitable.
Subaru Outback
225/55R16
Yes, you can
225 60R16
Mazda RX-8
225/60R16 for GT and 225/70R15 for SE
Yes, you can do it.
The equivalence is 225 50 R18 so that the diameter may be the same.