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Old 10-27-2008, 08:39 AM   #7 (permalink)
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Originally Posted by groar View Post
In MetroMPG's experiment, 44 psi rated tires are used and they get their better score at 50 psi.

Of course different brands, different results.

That result could be well within the margin of error for the kind of testing that was done.

We know that rolling resistance as a function of inflation pressure varies more or less linearly. A tire with more inflation pressure will always have less, or at worst the same, rolling resistance the same tire with less inflation pressure.

How much it impacts FE depends on the vehicule, mainly what portion rolling resistance represents compared to other sources of drag, but you can safely assume that more pressure will result in the same of better fuel economy.
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