Tire choices 185/65/15 vs 195/65/15 Ecopia EP422 vs Yokohama Avid Ascend GT

I just purchased a set of 195/65/15 Yokohama Avid Ascend GT tires for my 2002 Jetta TDI. I haven't used my beloved Harbor Freight Manual Tire Changer and bubble balancer yet to put them on, but my Ecopia EP422 Plusses are getting down to the wear bars on my 2005 Prius.

The Yokohamas are supposed to be LRR with BluEarth and do better in the snow per TireRack than the Ecopias. I might go with these on the Prius too but wanted your thoughts. There is something to be said about having several cars with the same tires especially since I am going to be mounting them and balancing them myself.

Also, I would like to potentially go with the same 195/65/15s on the Prius for similar reasons etc. I would also like to lift it a few mm while at it. However, I am concerned with fuel economy to include accuracy, odometer accuracy etc. I did some searching around and it almost seems like 195/65/15s might somehow be more accurate than the stockers. If that is not the case then would I be hurting my fuel economy by going with the 195/65/15 vis a vis 185/65/15?

Thanks for your thoughts and time in advance!

 

Thanks. 195 is going to be a little easier to mount considering my back woods approach of mounting as well now that I think about it.