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"  Three years ago Yokohama introduced its dB Super E-Spec, a tire which uses oil from orange peels as an ingredient. The company touted it as a better tire for the environment; though the orange oil displaces just a small amount of petroleum in the tire itself, it improves the life of the tires and the car&amp;#039;s fuel economy. Goodyear has also been looking for an Earth-friendly new additive; two years ago the company began researching a processing aid that could replace petroleum in case prices rose too high. Recent tests have shown Goodyear&amp;#039;s Innovation Center might have found the replacement it has been looking for: soybean oil.  By replacing petroleum with soybean oil, Goodyear says it can save up to seven million gallons of the non-renewable stuff each year. In addition, soybean oil turns out to be a more effective processing aid. Mike Kernf, manager of global materials technology for Goodyear, says that tread life could be increased by up to 10 percent.  So far Goodyear won&amp;#039;t say exactly how much soybean oil it plans to use in each tire, or how, citing the need to keep industry secrets. But the company says it sees no technical hurdles in mass producing soybean oil tires. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/cars/a7956/goodyear-trying-to-put-soybean-oil-in-tires-11053063/>