This paper presents routine refracto-densimetric indicators which may be used to identify unbalanced automobile gasoline and falsifications (surrogates). These criteria are supposed to reduce considerably the amount of testing via standard chromatographic and spectroscopic methods. Refracto-densimetric method for controlling the limiting weight content of oxygen is based on substantial difference between specific refractions of oxygenates and hydrocarbon gasoline components. Application of the refractive intercept which is additive in the volume fractions of components and constant for different homologous series of hydrocarbons allowed to establish its maximum value, the excess of which identifies a gasoline with a high content of aromatic hydrocarbons. In addition, the excess of refractive intercept of certain limit value can also indicate the possible presence of conjugated diolefins in gasoline and bicyclic arenes. (C) 2014 Elsevier Ltd. All rights reserved.