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But there's diminishing returns for anything related to fuel economy, that's not a new idea, nor do I think it's important to the question of safety.
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It is important to safety because as you start to overinflate, MPG gains level off and your safety starts to fall off rapidly to the point where you're giving up a lot of safety to secure a very small amount of economy.
Some of the guys on the Cavalier forums think I'm insane for running my 44psi max tires, at 44psi. Granted, they might be on the other extreme, but do you really want to find out how thick the margin of safety is on your tires? Remember that this margin accounts for manufacturing variances that can't easily be quantified. Just because so and so was fine running at 25% over, you might not be so lucky.