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Old 03-10-2018, 11:59 AM   #32 (permalink)
ksa8907
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Join Date: May 2012
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Volt, gas only - '12 Chevrolet Volt Premium
90 day: 38.02 mpg (US)

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90 day: 132.26 mpg (US)

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Thanks for doing this experiment!

Quote:
Originally Posted by RedDevil View Post

This puzzles me.
I can't see how load influences rolling distance.
The contact patch would always be flat unless the road surface gives way (mud, sand, snow). Even if it does deform, as long as it approximates flatness it will still be very near constant as the difference reduces quadratically.
Pressure may stretch the belts a bit, but every tire has some pressure so they are already tight.
My understanding of this is that the distance from the axis of rotation to the road surface is what determines the rolling distance. Which means that load and inflation pressure are the primary influences.

Circumference is irrelevant.

While calculations comparing tires using the typical tire measurements xxx/xx/xx are relevant, they are not absolute since they don't consider deformation at the contact patch.

I am very skeptical that the steel belts stretch over time
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