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The general rule for tire manufacturers is tire pressure on the sidewall is cold and you'll get 4-6psi as the air expands during normal driving (usually in 1-2 miles). 52psi cold is significantly over the rated pressure. The most likely consequence is going to be early tread wear on the center of your tire, but it also effects traction and handling. I'd be comfortable with 4psi over in the summer, but I stick with the sidewall rating during the winter (I live in snow and ice country).
Also, realize that being 8psi over is probably not buying you more than a single MPG and maybe not even that. If you were driving around at 20psi, more than likely it would only cost you 1-1.5mpg. You're better off investing your time and energy into the grill block, driving technique and aeromods, thus saving yourself the expense of having to replace tires more often because they're wearing faster.
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