I was browsing for some new tires and came across this Product service bullitin from Goodyear. The gist of the article is that with the marathon tire, if you exceed 65 mph you need to increase cold inflation pressure by 10 psi. It does not increase the load rating of the tire, just allows the tire to be pulled at 75 mph. Here is the link:
http://www.tirerack.com/images/tires...plications.pdf
http://www.tirerack.com/images/tires...plications.pdf
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