No, the 195/65-15 tire is way to large in diameter. Your speedometer will be off 5 mph, and your handling and mpg will suffer.
Yes, that is a reasonable substitution.
Yes, they can
Yes, you can
Yes, you can
Yes, this is an excellent substitute.
You can but your speedometer will be off. Want to go wider then go with a 195/60-15.
Sure, if you change all four; the difference is about a quarter of an inch in diamater.
You can, but it is not a good swap as your speedometer will read 58 mph at a true 60 mph. I don't understand why you would want to go to a narrower tire but if you do you should go to 185/65-15.
Yes, if you mount as a pair. Both tires on axle must be the same
Possibly, check they don't rub anywhere while steering.
As far as I know, the different sizes you can fit are: 185/60 R15, 185/65 R15, 195/55 R15, 195/60 R15, 205/55 R15 and 215/50 R15 on the 6x15 alloys. Chris from DIDCOT TYRE & EXHAUST
Yes, this is a good swap and should work quite well.