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I think these tires are made of ground unicorn horn
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HA! Good one!
I'd heard of
walnut shells in tires for winter traction - amazing it took us this long to think of adding unicorn horn for LRR.
Can you quantify your gain as a percentage? +3-4 MPG means something very different to a 50+ MPG Prius driver than it does to a 30 MPG run of the mill sedan driver.