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This whole discussion has been a regular hoot! But in the process of researching info for making an informative reply, it seems there is a lot of grey area in this whole issue. Other discussions on this forum point out that 50 psi seems to be the happy medium between not enough braking and cornering and too little air to get good FE.
To be quite honest, I never did put much stock into the recommended psi on the placard and just filled to maximum sidewall. I've occasionally overfilled to 50, but only with a bit of trepidation. One guy I knew had a Ford F-250 Powerstroke that he managed to drive like a maniac and still get 19-20 mpg out of. And this wasn't no eco vehicle either. It had a crew cab, full length bed, 4WD, the lot. But anyway, he put his tires up to 80 psi, and he had a heckuva time stopping that thing in a timely fashion. That and it rode like it had hard rubber tires from a forklift. You hit a ant and I could tell you what it had for breakfast by listening to the ensuing rattles. I think he took it a bit far
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 RIP Maxima 1997-2012
Quote:
Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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