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Contacted Dunlop/Goodyear today and this was their advice.
Operating air pressure is determined by the vehicle manufacturer.
If you're using the same size tire that came as original equipment on your vehicle, the proper air pressure is indicated on the door
placard or owners manual of your vehicle.
The air pressure indicated on the sidewall of each tire is the inflation pressure required to carry the maximum allowable load for
that tire. Vehicle manufacturers have invested considerable time and testing to establish an air pressure that will provide a smooth
comfortable ride in addition to an even treadwear pattern.
Our recommendation would be to stick with the air pressure established by your vehicle manufacturer.
Thank you for your inquiry through our web site.
Vanassa F
Consumer Relations
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