I'll be honest, I don't see any point in raising tire pressure. Any pressure above what the car manufacturer tells you, and you're simply eating up your tires. You'll save a penny on gas and spend 10 cents on tires.
Run it at stock pressure.
If you want to save a buck on gas, buy it in bulk whenever it's cheap. That has a LOT more to do with your cost per mile for gas than your tire pressure.
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