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Car expert Boris Feldman explains how to calculate what is more worthwhile (between ethanol and gasoline) when filling up a flex-fuel car. Subscribe to CNN Brasil's YouTube channel. FOLLOW CNN BRASIL ON OTHER PLATFORMS: Website: https://www.cnnbrasil.com.br/ Newsletters: https://newsletter.cnnbrasil.com.br Facebook: / cnnbrasil Instagram: / cnnbrasil TikTok: / cnnbrasil