Yes you can but it is not advisable. The 215 tire will be 2.09% larger in overall diameter. Your speedometer will read 58.7 at a true 60 mph. You will also have less power at take off. Stick with the OEM size.
yes
Yes, you can.
Its on the tire , look closely toward the rim. Tires cannot be manufactured without a maximum cold pressure rating.
It depends on if you have the clearance and the tires don't rub the inside of the fender when turning.>Al
As long as all 4 match, the height difference between 65 and 70 should not cause a problem on most vehicles.
Yes, that is a pretty good substitute.
You can substitute these tries if need be. But if you do this your car will be off balance.
no
Yes, you can substitute the 205/75-15 for the 215/70-15.
Yes, they can
Yes, they can
Yes you can