1.   It is a leading producer of both lower-emission gasoline and the additives that make gasoline burn cleaner.

2.   Super Octanos produces methyl tertiary butyl ether, a gasoline additive used to boost octane and add oxygen, which makes the fuel burn cleaner.

3.   Super Octanos uses isobutane to make methyl tertiary butyl ether, a gasoline additive used to boost octane and add oxygen to make fuel burn cleaner.

4.   Super Octanos produces methyl tertiary butyl ether, a gasoline additive used to boost octane and add oxygen to make fuel burn cleaner.

5.   The fire chief suggested servicing the oil burner to make it burn cleaner.

6.   White-crude products burn cleaner, pleasing both environmentalists and industries that must comply with clean air standards.

7.   Both MTBE and ethanol add oxygen to gasoline to make it burn cleaner.

8.   Reformulated blends, which include an oxygen additive to make it burn cleaner, account for about a third of the gasoline sold.

9.   The additive - methyl tertiary butyl ether, or MTBE - helps reduce air pollution by making gasoline burn cleaner.

10.   The EPA requires gasoline sold in cities with the most severe summer smog to contain oxygenates to make it burn cleaner.