The folks on CleanMPG appear to be extreamly bias to anything that gets them an extra MPG IMO. It reminds me of the mentality that pot smokers have about how it is good smoking weed is for you. They have people that swear driving high is safer than driving sober... same mentality here. I read through that forum and some people are using 3 times the max sidewall pressure, that is the stupidest most dangerous thing I have ever seen. You are going to take advice from them?
I am telling you right now there is more data and information than you can digest to tell you that you are comprimising your cars handeling and braking by pumping up the tires to that PSI
This is proven time and time again.
I have stated about 10 times before, you car WILL suffer on both aspects dramatically if you exceed about 42psi (give or take a few pounds depending on tires). This is easily proven by anybody who does autocross, tire pressure is optimized for max handeling under the most demanding conditions (conditions I would smack you upside the head for if you replicated them on public roads in a non-emergency situation).
As I have also stated before, your braking will begin suffer at the higher PSI where handeling is optimized. Anything higher than that will beyond a reasonable doubt negitivly affect your car. Don't believe me, go have a third party do some controlled testing. Your car will be engulfed in a cloud of tire smoke if you try to push it.
I agree with you there is some safety factors and comfort added in to the reccomended PSI. I won't give anybody grief for running 36 or even 38lbs in the tires.
But pull your head out of the sand, you want to claim it gets better MPG, I won't disagree. I will challange you that your tires WILL wear out sooner and also that it does VERY negitivly impact your handeling and braking at those PSI's. Anybody says anything different and it is nothing but a giant propaganda speech.