From what I've heard the "10 & 2" position was recommended before air bags were installed in all cars. Now the recommended hand position is 9 & 3 to reduce the chance of injury to your arms if the steering wheel air bag should deploy.
Reference the hand position at the bottom of the steering wheel palm down isn't a good idea. I remember teaching my daughter to drive and her using the palm down/bottom of the steering wheel position during cruise...I had to try and break that habit since if she needed to make an evasive maneuver her hand/arm rotation would be severly limited...your shoulders just won't allow but about a quarter turn of the wheel and a "for sure" broken wrist if you crash IMHO.
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Jack 09 370Z
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