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i used to ride on 52-54 psi, but on my set up (spacers, low profiles , upgraded side wall tire size) i started getting way to extra wear in the center of the tires and none on the outside.
so just make sure you are watching you wear closely if you have anything from stock set ups.
i am running low 30s now to compensate for the bad wear I was getting, economy...no not really, but you could look at going through tires quicker as a waste of money too and at the end of the day it is economy to save your tires and get better conistent tread wear.... blah blah....
kinda off topic, but ultimately just watch your wear when messing with tire PSI
i didn't notice too much MPG from going to low 50s by the way, and it was pretty stiff and rough.
not worth it to me, id rather coast and have better driving practices for MPG, and aerodynamics
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