skibender wrote:At 40 psi, you'll probably have excessive wear in the center of the threads. 40 psi might help with mpg but it'll wear your tires out faster. The cold weather brings down mpg.
I agree 100%...I travel 80,000 plus KM's per year and my tires are set at 32-34psi. MPG definately decrease by 10-15% in the cold weather dependant upon driving style and length of time you let in warm up in the morning.