Patent ID: 8671891

Claim:
A method of expanding an advanced combustion engine's operating envelope during operation in an advanced combustion mode, the method comprising supplying an engine cylinder during operation in the advanced combustion mode with a blend selected from the group consisting of: (a) a blend comprising about 5% to about 15% by volume of ethanol and about 85% to about 95% by volume of a gasoline enriched in cyclopentane; (b) a blend comprising about 15% to about 25% by volume of ethanol and about 75% to about 85% by volume of a gasoline enriched in cyclopentane; (c) a blend comprising about 25% to about 35% by volume of ethanol and about 65% to about 75% by volume of a gasoline enriched in cyclopentane; (d) a blend comprising about 35% to about 45% by volume of ethanol and about 55% to about 65% by volume of a gasoline enriched in cyclopentane; (e) a blend comprising about 45% to about 55% by volume of ethanol and about 45% to about 55% by volume of a gasoline enriched in cyclopentane; (f) a blend comprising about 55% to about 65% by volume of ethanol and about 35% to about 45% by volume of a gasoline enriched in cyclopentane; (g) a blend comprising about 65% to about 75% by volume of ethanol and about 25% to about 35% by volume of a gasoline enriched in cyclopentane; (h) a blend comprising about 75% to about 85% by volume of ethanol and about 15% to about 25% by volume of a gasoline enriched in cyclopentane; and (i) a blend comprising about 85% to about 95% by volume of ethanol and about 5% to about 15% by volume of a gasoline enriched in cyclopentane.