Paragraph 10
The amount of any liquid additive or extender used at his premises as an additive or extender in fuel used at his premises in one of the engines described in subparagraph (a), (c) or (d) of paragraph 3 above.
The amount of any liquid additive or extender used at his premises as an additive or extender in fuel used at his premises in one of the engines described in subparagraph (a), (c) or (d) of paragraph 3 above.