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A field test was conducted in order to evaluate the effect of detergent additives on vehicles representative of the Venezuelan automotive fleet using a Venezuelan gasoline, in terms of carburetor deposits formation, fuel economy, and exhaust emissions. The field test was performed in twenty carbureted vehicles of two different models that were divided into three groups. Two groups used gasoline with detergent additives evaluated with the supplier recommended dose. The third group used a base gasoline without additive, representative of those provided for the internal market by all refineries in the country (95 RON). This was the same base gasoline used for the additized groups. Each car was chosen so that all cars of the same model had similar carburetor deposit evaluation and fuel economy measurements.