I really believe that all comments were helpful in making up my mind. I will use without any fear or hesitation the spare when needed, following the common sense (and Mazda’s cx5 manual) from the majority in this forum. Thanks a lot.

 

I wasn't debating that at all I was just saying ... well re-read my response. LOL
Ya so you have no clue what I meant or the meaning of my response!

This is what is wrong many times with forums like this the majority is not always correct and actually often time they get it wrong!
I the best thing you can do is follow the owners manual to the letter unless there is a notification of correction from the auto manufacture.

 

Peg leg often used by GEAR HEADS and HOT RODDERS refers to a none locking differential. If the differential is locking, limited slip ,posi-traction(posi), Detroit Locker or many other names that depicts both wheel rotating at the same time or same time under torque applied. Then using any tire/wheel combination that is a different diameter on the same axle could cause problems or damage to the differential.