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I go moderately above the 44 psi rating on the sidewall of my Michelin Defenders, using tests on this site as a guide. So, under "cold" conditions (in the morning and before driving), I pump to 56psi+ because an extra 10psi seems to be the limit for big gains in fuel economy. By setting the PSI when the tires are cold, I ensure that my psi does not likely drop under 10 on a daily basis and for a while. I also know that the tires will likely not often or at all cross 60psi when hot. I used to set them at 60psi minimum. They can take MUCH higher pressures, but there is little/no benefit for fuel economy purposes. I have not had any problems doing this for six and a half years now, 12k miles per year or so. In reality, low pressure is the bigger danger because of how all the flexing as they roll heats up the tires.
Others have diff experience. You have to follow your best judgement. And always keep an eye on tire condition. Old cracking, dry-rot tires are not safe at any speed. Get rid of them.
james
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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