Crossword clues for Gasoline additive. 6 letters:OCTANEGasoline additive.ETHANOLCommon gasoline additiveETHYLGasoline additiveTOLUENEGasoline additiveANTIKNOCKGasoline additiveETHANOLGasoline additiveODORGasoline additiveSCENTGasoline additiveLEADGasoline additive, onceSTPGasoline-additive initialsTCPGasoline additive: Abbr.ETHERPart of the gasoline additive M.T.B.E.STPGasoline additiveSTPGasoline additive brandETHYLFormer gasoline additiveETHYL___ alcohol, gasoline additiveLEADAdditive no longer used in Canadian gasoline