Couple of short responses as I head out the door.
1. A bit more research on your part....I can't verify the ply count, however, a 10 ply tire, due to the carcass stiffness would ride incredibly harsh.
Should not effect mpg though.
2.Sizing and tread: What do you want the tire to do?
For example, blocky mud/off road tire is a awful snow tire because it rides on the tread blocks and there is less rubber on the road. It is also a poor rain tire for the same reason.
Regarding sizing, we have LOTS of threads going over various combinations that work, kinda worked, and didn't work at all.
Search around, refine your questions, we will all try to assist you.
Last edited by robby; 10-31-2009 at 05:42 PM.