Here's a quote from an email I received from Bob Gillespie, in response to my question about the tire pressure penalty:
"Hi Bruce.
... We will deduct one point from your score if the pressure is higher than the max pressure stated on the tire.
You will not be disqualified. I suspect that all eco-modders will probably receive the same one-point penalty.
It does not translate to a deduction in your mpg score...
Bob Gillespie
Welcome To The Official Green Grand Prix Web Site "