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You could read this:
http://www.officer.com/article/article.jsp?siteSection=19&id=27281
It gives some information on why I feel safe at 50 psi. Why it helps fuel economy is another matter. Higher pressure helps f.e. because the rubber flexes less, giving a more efficient transfer of energy.
I wouldn't try it on aged tires of unknown history - however I bought my current tires new just a few months ago.
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Sven: '89 245 NA, 951 ECU, expanded air dam to 7' from ground, forward belly pan reaches oem belly pan, open-front airbox, E-fan, 205/65-15's at 44 psi, IPD sways, E-Codes, amber front corner reflectors, quad horns, tach, small clock. Wifemobile '89 245
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