Patent ID: 6860909

Claim:
A method for operating a diesel engine to produce low emissions which comprises combusting a blended fuel with oxygen or an oxygen containing gas, the fuel comprising; (a) at least 5-90 wt. % of a hydrocarbon distillate boiling in the range of 250-700° F. derived from a Fischer-Tropsch process and containing at least 90 wt. % paraffins ≦50 wppm sulfur, nitrogen <1 wt. % aromatics, and (b) a cracked stock boiling in the range of 250-800° F. and containing ≧30 wt. % aromatics ≧20 wt. % polyaromatics wherein the blended fuel contains 10-35 wt. % aromatics and 1-20 wt. % polyaromatics, and <500 wppm sulfur, and the blend having combustion emissions properties at least equivalent to those of a 10 vol. % aromatic fuel under subsection (g), Section 2282, Tide B, of the California Code of Regulations.