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I think it depends on the car. My MR2 doesn't seem to coast much better from adding more psi, so I keep it about 8 psi higher than the door sticker (26/32 front/rear I'm at 35/40 ish), which is about the worst ride comfort I'll tolerate. I don't think it really saves much gas but the psychological effect that makes me think I'm saving gas is good enough that I will tolerate the bumpier ride.
My parent's Honda Pilot calls for something stupidly low like 26psi, and one time I secretly pumped them up to 35. Coasting distance was way better, but ride quality did suffer a little, not much though.
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