I went from an all season T rated touring Goodyear Eagle GA to a wider UHP Z-Rated (W) Michelin Pilot Sport A/S. 235/55/TR16 96T -----> 245/50/ZR16 98W Can this account for losses between 2-3mpg? The handling and wet grip is amazing, but this must come at a cost of higher friction and rolling resistance. I swear since the change my car FI has dipped severly. Again the handling is amazing compared to the snow and rain near deadly GY's.