06-07-2008, 10:39 PM
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#7 (permalink)
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Batman Junior
Join Date: Nov 2007
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The coastdown vs. PSI test essentially proves that you'll improve MPG by inflating tires to where the curves level out.
As Daox suggested, the actual MPG difference is going to vary from car to car and tire brand to tire brand. You'll never find any info that says "you will increase MPG by 4% if you inflate your tires 15% over placard rating".
And even if you did, it would be useless to you unless you have the same car & tires!
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