I created this chart so you all can compare side-by-side each the most popular tires for the X5 with 20's and 315's. I wasn't able to find any data on the Toyo's, other than they're very inexpensive.

When it comes to selecting 315/35/20 tires, the choices are limited.

Prices/data comes from tirerack.com.

Click here for UTQG explained