NOVELTY - Producing a mesitylene-isopentane fuel, comprises: (a) passing acetone in contact with a catalyst in a gas phase reaction to form reaction products in which a portion of the acetone feed is trimerized to form mesitylene or either the remainder of acetone feed is dimerized to form mesityl oxide; (b) separating the mesitylene from other reaction products; (c) converting the mesityl oxide in a series of reactions to isopentane by subjecting the mesityl oxide to dehydration, demethylation, and hydrogenation; and (d) mixing the separated mesitylene with the isopentane.    USE - The method is useful for: producing a mesitylene-isopentane fuel such as renewable turbine and diesel fuels from renewable sources comprising animal oil and plant oil such as soybean oil, rapeseed oil, canola oil, corn oil (preferably), and/or palm oil, for internal combustion/turbine engines of an aircraft.    ADVANTAGE - The method ensures economical and energy efficient production of the mesitylene-isopentane fuel.    DETAILED DESCRIPTION - Producing a mesitylene-isopentane fuel, comprises: (a) passing acetone in contact with a catalyst in a gas phase reaction at a temperature of 250-400 degrees C, at a liquid hourly space velocity of 1-8, and at a pressure of 50-200 psi, where the catalyst comprises 0.5-10 wt.% of metal oxides comprising vanadium oxide, niobium oxide, and tantalum oxide obtained from water soluble salts to form reaction products in which a portion of the acetone feed is trimerized to form mesitylene and/or either the remainder of acetone feed is dimerized to form mesityl oxide or other by-products; (b) separating the mesitylene from other reaction products; (c) converting the mesityl oxide in a series of reactions to isopentane by subjecting the mesityl oxide to dehydration, demethylation, and hydrogenation; and (d) mixing the separated mesitylene from with the isopentane.    DESCRIPTION OF DRAWING(S) - The drawing shows a block flow diagram illustrating a method for producing mesitylene-isopentane fuel.    Phase separator (9)    Distillation column (15)    Holding tank (21)    Dehydration reactor (23)    Hydrogenation reactor. (27)