Of course you can but I would not recommend it because your speedometer will be off about 3 mph. I better choice in wider tire would be a 215/70-15. You speedometer will only be .5 mph off.
Yes, you can
no
Yes, that is a pretty good substitute.
It is an acceptable substitute, but know that your speedometer will read 58.7 at a true 60 mph.
Yes, that is reasonable as long as both sides match.
Yes, if you can live with an inaccurate speedometer.
205/70/r15
The 205/70/r15 is 26.3 inches tall. The 215/65/r16 is 27 inches tall. Never mix different size tires on different rims.
Yes, this is a good alternative. Your speedometer will be only be 0.6 mph too fast.
That depends on if the 15 inch rims will fit over the brake calipers.
Yes, but check carefully for steering clearance
No, your speedometer will be 3 mph too slow. A 205/60-15 will be a good substitute with almost no difference in overall diameter.