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I been getting real crappy mpg and was told it could be the tires so just bought a gauge the other day and i'm getting about 16-20 psi on the tires, seems a bit low, can someone tell me what the correct psi would be for them. The wheels are stock 16s. The rears are 235/55 and the fronts are 225/60.

Thanks.
 

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32 psi cold. I think the door says 35 psi cold for speeds over 100mph. Look on your door for the correct tire size for your car, I think those are wrong. If they are a different height from stock and the speedo wasn't calibrated, calculating mpg from the odometer could be part of the problem. Just food for thought.
 
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