Assertion: gas | /r/MadeOf | ethanol
Facets:
value: to improve combustion
type: PURPOSE
Source sentences:
text: Gasoline may contain oxygen-containing chemicals such as ethanol, MTBE or ETBE to improve combustion.
text: and you’ll see a sticker noting that the gas in that pump contains ethanol.
text: Gasoline containing ethanol is especially subject to absorbing atmospheric moisture, then forming gums, solids or two phases (a hydrocarbon phase floating on top of a water-alcohol phase).