REFORMULATED GASOLINES
* Amoco will begin marketing a cleaner form of all three grades of its gasoline in the Chicago area this summer.
* Arco introduced its EC-1 low-emission regular gasoline in Southern California last September, targeting older vehicles not equipped with catalytic converters. The company is working on cleaner-burning gasolines for newer cars.
* Conoco began testing its environmentally improved gasoline, Regular RXL, in the Denver area in March.
* Chevron started offering its Chevron Supreme Unleaded premium reformulated gasoline in Los Angeles and San Diego on Tuesday, and will offer it in Houston and Baltimore later this summer. The company also unveiled Chevron Special Diesel in five counties of Southern California.
* Diamond Shamrock introduced its RG-87 reformulated gasoline last December, replacing its leaded regular at the 77 Diamond Shamrock Corner Stores in the Denver and Colorado Springs areas.
* Exxon brought out Exxon Plus and Exxon Supreme reformulated gas this month in 20 Northeastern and Gulf Coast states.
* Marathon Petroleum began test marketing Amaraclean gasolines in the Detroit metropolitan area March 26. The company is looking to expand into Chicago, Cleveland, Cincinnati and East St. Louis, Ill., although no firm plans have been announced. Marathon is first to offer reformulated gasolines in all three octane grades.
* Phillips Petroleum began a six-month test program of its new Phillips 66 SuperClean Unleaded Plus in the Denver and St. Louis areas April 22, Earth Day.
* Shell Oil Co. introduced SU 2000E in April. The new gas is available in the New York City, Hartford, Conn.; Chicago, Houston, Los Angeles, Philadelphia, Baltimore, Milwaukee, Wis.; San Diego and Washington areas.
* Sun Co. began offering reformulated diesel fuel last November at Sunoco stations in the Philadelphia area and hopes to market a reformulated gasoline by year-end.
* Mobil, Texaco and Unocal say they are waiting for the results of a joint research project being conducted by oil companies and the Big Three auto makers, testing low-emission gasolines with different kinds of internal combustion engines. Results of the first phase of the multimillion-dollar study are expected at year-end.
