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Factors to consider:
1) That 220 PSI is static pressure. In driving, you'd likely see jumps as the wheel goes over bumps & potholes. (It'd be interesting to see if anyone has actual data on this.)
2) 220 PSI is cold pressure. Drive for a while and the heat will increase the actual pressure. so maybe 150 PSI or so would be the max cold inflation pressure.
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