Well, the OEM tires just bit the dust (Prius 2010 base with 195/65R15), 2 are at the warning bar level or close to it, and one has 2 nails in it, one in the middle the other in the side wall . So after looking for the Michelin Energy's and finding out they are "out of stock everywhere" I opted for the Nokians. I also considered the Goodyear Assurance High Mileage tire. I will post a review after I get a couple of tanks of gas to verify the mileage. Will also give some comments on the handling and hopefully "snow" response. In weather above 32F/0C I typically get 50 to 54 MPG according to the dash gauge. From the manufacture they have a 50,000 mile warranty, tread rating of 700 AA which is promising. Everybody have a happy and safe new year! Gerry My 1,500 mile update. Nokian eNTYRE UTQG=700 AA 50psi max, I am running them at 45psi $125 apx. Initial impression is they are quiet riding, however they are stiff compared to the Yokohama Avids (probably due to the higher air pressure). Noise: No difference compared to the stock Yokohama's. Handling: Significantly stiffer, my wife says the Prius now rides like my old explorer. It did rain one day, the tire did not hydroplane, but it wasn't a thunderstorm. Traction: Significantly better than the Yokohama's, especially in snow. It is snowing today and I did straight line braking, the abs kicked in, and the car stopped in a nice straight line. I did the same on some curved roads, again the car followed the curve and remained in control. Note all done at 30 mph, on empty roads. UPDATE in 4 inches of snow stopped at the top of a slight hill, had to back down to get to the top. Mileage: Now what everybody is waiting for, the car computer said between 50 to 52. Almost all the driving was in cold weather below 28F. I compared the Yokohama's at a calculated mpg of 48.97 vs 48.26 for the Nokians. Please NOTE the Yokama's had less than 1/8 inch thread left on them, and the air temperature was well above 32 probably closer to 45F, the Nokians have only been in real cold weather. Driving style, at speed limit in town. On the divided highway I keep up with traffic which is always above the speed limit. Note half the driving is city and half is highway. Appearance:They are black. . Price: $550 included mounting, tprs maintance (1 unit) and insurance for the tire. Summary: I like them. UPDATE 15 APRIL 2012 So with a full tank of gas, 80% highway driving +speed limit, minimal heat, no AC, I am getting 53.84 calculated, 56.7 car computer, over 361.5 miles, temp +40F, AVG speed 38 mph (which I don't believe). UPDATE 16 JULY 2012 11,ooo miles on the tires. All computer mileage below, 65.2 mpg end of march over 87.1 miles, 60.8 mpg average speed 24-26 mph 2 fill ups no AC or heat used. Wear has been uniform.