Yokohama Tires Super Nano-Power Rubber

Higher density would also effect it, which would have an adverse affect on fuel economy.

The test proves nothing relevant as it isn't even a tyre, if they are so sure it makes any difference why not run two tyres like that?
 
ultimately the weight of the object (or density if you like, as above) will have the biggest effect in this test.

lets face it, if it were true, there would be no grip.
 
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