Anything between the 32 and 38 is acceptable. I've used the lowest and the highest for both of my cars with similar results as you (even the rattling), so choose the best of both worlds or the least bad of both worlds...comfort zone vs. gas milage. Actually, I believe that handling is better with higher pressure. Braking distance should not matter as much.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.
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