The term 'Tiger-in-Your-Tank Brand' refers to the Esso brand of gasoline, which is owned by ExxonMobil. Esso is a four-letter word that is commonly used in many countries around the world. The brand was first introduced in the United States in the 1920s and has since become a global brand. The slogan 'Put a Tiger in Your Tank' was first used in 1959 and has become synonymous with the Esso brand. The slogan was meant to suggest that using Esso gasoline would give drivers more power and performance.