Original post by: brandtons ,
Looking at the site, if read everything and type in your information, at the bottom of the screen there is a button that will calculate everything for you. But you have to pick a tire for all axles. Kevin keeps saying if your rolling resistance is as high as yours, you can take brand new tires and Throw them out, switch to a better rolling resistant tire and come out on top. If you use the fuel savings calculator you will see what I'm talking about.