Look I'm in Northern Wisconsin and it is winter temperatures here. It is going to be below 10 degree tonight. Just cold temperature can take a huge hit on mileage. Then there is the 10% ethanol that most stations sell. That said, I got just over 30 mpg going to Church in early AM. I got over 32 mpg going to the ski area later in the AM and early afternoon hours. I can tell a difference in the rolling resistance compared to my EcoPlus tires. Then again the psi of my winter tires 39 isn't as high as my warm weather tires 43 psi. During the summer months when I was here, I usually netted mpg runs of 34-37. I would guess the tires cost me 1 mpg or 3%.

John Morton has Bridgestone tires and he highly recommends them.

On the Greenhybrid site there is information on rolling resistance of a few tires tested by Europeans. Look here: http://www.greenhybrid.com/discuss/f...00/#post165877

2005 AWD Escape Hybrid
Best Interstate tank trip MPG 39.02 (scangauge II) for 402 miles on I-70, 10.3 gallons used over mostly flat terrain.

Best Interstate tank trip E30 MPG 34.6 for 271 miles along I-80 in Indiana and Ohio.

Best multiple road tank trip E30 MPG 36.2 for 202 miles in Southwestern Pa.