11.   But the study did not find reformulated gasoline ineffective in general.

12.   Counties that opted out of reformulated gasoline will generally have to find some means of reducing emissions.

13.   Credit goes to reduced auto emissions and a reformulated gasoline in use since June.

14.   Currently, federal law requires a certain percentage of oxygen in reformulated gasoline.

15.   Elsewhere, the Environmental Protection Agency said it would announce changes to the rules of its reformulated gasoline program possibly as soon as next week.

16.   Ethyl has not yet applied for approval to mix MMT into reformulated gasoline, although company officials say they intend to do so.

17.   Environmental and health groups are now responding with publicity campaigns defending the clean-air efforts, including the introduction of reformulated gasoline.

18.   For example, the government advocates increased use of clean fuels like natural gas, low-sulfur diesel fuels and reformulated gasoline.

19.   Gasoline fell after a larger-than-expected weekly drop in U.S. gasoline inventories was overshadowed by rising supplies of cleaner-burning reformulated gasoline.

20.   Gasoline prices slipped amid concern more areas are trying to abandon their use of reformulated gasoline, the cleaner-burning grade specified by futures contracts.