So, after some efficient forum surfing thanks to all who post about the tires, I quickly came to the conclusion that getting the Michelin Energy Saver tires was the way I wanted to go. Even if I get a .5 MPG improvement they'll pay for themselves over the course of their life and more. (I currently have the Goodyear Integrity tires on both of my Prius's) Based on some links here I ended up purchasing them from TireRack.com pretty decent price, I was also happy to find out they are based in Windsor CT which is not too far away from me!! So they are allowing me to pick up, with tax total will be $876.32, or $109.54 each. Pretty good price, but wait, there's more... TireRack has a $70 per set of four rebate going on, so taking off an additional $140 on that prices reduces the total to 736.32 or $92.04 each!!! SWEET!! (just gotta wait 4-6weeks etc) Anyway thought I'd share my excitment, and thank all for the informative posts here.