2017 Nissan Murano Platnium Edition

No, they are 3" smaller in diameter, too much of a difference from the stock 235 55 20. Stick with the OEM size.

Yes, the car came with 235/55R20 tires. Stay with that size or one size up, like 245/55R20, otherwise, you mess up the wheel sensor readings and ABS brakes, and your speedometer will be off. If you just want the slimmer look, you can use any tire size you want; just be aware of the problems you'll be dealing with in the future.

As long as you don't go to smaller rims, do what the Mexicans do. Make it a low rider.