Along with such conventional labels as regular and premium, a third sign is popping up at U.S. gasoline stations: unleaded. Until recently, unleaded gas has been available only in small amounts. By order of the Environmental Protection Agency, however, it must be offered after July 1 by all stations pumping 200,000 or more gallons annually—about half of the 220,000 gas stations in the nation. The unleaded era will be one of added expense for many drivers, and it is opening amid considerable controversy.
The new fuel can be used in any car with a low-compression engine not requiring the antiknock properties...
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