Abstract: An improved energy-saving fuel additive for diesel engines and gasoline engines which comprises separate compositions which raise the flash point from about 6.degree. to 29.degree. C. In the case of the diesel additive, the following formulation is preferred:Elemental iron: 0.01%Methyl isobutyl ketone: 5.0%Picric acid: 1.5%Normal butyl alcohol: 20.0%Kerosene: 73.0%Nitrobenzene: 0.08%Primene 81R: 0.05%The composition of the agent for gasoline to high flash point is somewhat different and may be noted as follows:Copper carbonate hydroxide: 0.02%Methyl isobutyl ketone: 5.0%Normal butyl alcohol: 20.0%Kerosene: 73.0%Picric acid: 1.5%Nitrobenzene: 0.08%Primene 81R: 0.

Abstract: This invention pertains to an improved energy-saving fuel additive for jet engines, gasoline and diesel engines, including additions to domestic heating and light industrial oils (#2 and #3) and residual or bunker fuel (#4, #5, and #6), which comprises as active ingredients a catalytic mixture of a major proportion of picric acid and a minor proportion of cupric sulfate.______________________________________ Cupric sulfate .01-.03% Picric acid 1-2% Methanol 35-50% Isopropyl alcohol 15-5% Toluene 43-48% Nitrobenzene .6-1.0% Primene 81R .5-1.0% ______________________________________Additional variations include (1) the replacement of the toluene with about 10% methanol and 90% isopropyl alcohol for toxicity reasons and (2) replacement of the toluene with 10% methanol, 45% isopropyl alcohol, and 45% kerosene as a cost-reducing factor.A preferred additive is: ______________________________________ Cupric sulfate .02% Picric acid 1.54% Methanol 35% Isopropyl alcohol 15% Toluene 48.3% Nitrobenzene .8% Primene 81R .