The max on the tire is 49 psi. If you run that pressure on your Malibu, you'll most likely take the center tread out first due to over inflation. I think the stock tires are 44 psi max and the recommended pressure is 30 psi. I'm running 33ish right now for cold pressure. My opinion would be start in the lower to middle thirties, wherever you prefer, and watch your tread depth. Note it every so often, inside, middle and outside. All things being relatively equal, wear should be even across the tire. Center worn more = too high of a pressure and both outer shoulders worn = too low of a pressure. Assumes wheel alignment is correct of course.
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