NOVELTY - A fuel composition comprises: renewable bio feedstock component, a petroleum based component, and a multifunctional stabilizer package.    USE - As a stabilized fuel composition of renewable fuel feed stock and blend of petroleum for operating an internal combustion engine such as a compression-ignition engine (claimed).    ADVANTAGE - The additive formulation distinctly addresses the various aspects of instability in both bio fuels and bio/petroleum fuel blends by significantly inhibiting instability mechanisms (oxidative instability, hydrolytic instability, and thermal instability), and diminishing changes in the fuel (acidity, viscosity, color, odor, and gum formation propensity) thereby dramatically increasing the in-storage and in-use stability of bio fuels and bio/petroleum fuel blends. The multifunctional stability package also addresses all handle ability requirements for an additive to be utilized in the petroleum industry. The composition addresses the various causes (environmental and fuel factors) of degradation associated with storage and in-use instability of bio feed stocks and bio/petroleum fuel blends. By the use of a specifically chosen additive types or families (free radical chain termination agents, free radical decomposition agents, acid scavengers, photochemical stabilizers, gum dispersants, and metal sequestering agents) is designed to counteract or eliminate various specific modes/degradation pathways responsible for fuel instability. The storage stability of a renewable fuel is increased by metering into the renewable fuel, the multi functional stabilizer package (3 vol.%). the storage stability of a fuel composition is increased by metering into the bio/petroleum fuel blends the multi functional stabilizer package (3 vol.%).    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) method of increasing the storage stability of a renewable fuel by metering into the renewable fuel, the multi functional stabilizer package (3 vol.%);    (2) method of increasing the storage stability of a fuel composition by metering into the bio/petroleum fuel blends the multi functional stabilizer package (3 vol.%).