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Studies conducted on fuel efficient tires with better rolling resistance have shown that the fuel efficient tires are just as safe and effective as any other kind of tire. The California Energy Commission's study concludes that safety factors on the more efficient tires equal any other tire on the road rated in the same categories. There aren't enough of these tires in use at present; only about 12 percent of the tires on the road in some areas are considered fuel efficient. If these tires were used nationwide, it is estimated that up to seven billion dollars a year could be saved if all replacement tires were fuel-efficient.