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the claim

Ethanol is added to gasoline to increase octane.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
8 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that ethanol is added to gasoline to increase octane?

Yes. Multiple reference and peer-reviewed sources state that ethanol has a high octane rating and is added to gasoline as an octane improver to raise the fuel's octane number.

Verdict: SUPPORTED · 8 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 8
Ethanol
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Ethanol. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Ethanol

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More for · 7
Optimization of the octane response of gasoline/ethanol blends
2017
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Optimization of the octane response of gasoline/ethanol blends. (2017). doi.org. https://doi.org/10.1016/j.apenergy.2017.06.084

Increasing the octane number of gasoline using functionalized carbon nanotubes
2010
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Safari, K. S., Alimorad, R., & Reza, A. H. (2010). Increasing the octane number of gasoline using functionalized carbon nanotubes. inis.iaea.org. https://inis.iaea.org/records/hzxs7-gjx75

Octane Numbers of Ethanol-Gasoline Blends: Measurements and Novel Estimation Method from Molar Composition
2012
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Octane Numbers of Ethanol-Gasoline Blends: Measurements and Novel Estimation Method from Molar Composition. (2012). doi.org. https://doi.org/10.4271/2012-01-1274

Combustion phasing model for control of a gasoline-ethanol fueled SI engine with variable valve timing
2012
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Combustion phasing model for control of a gasoline-ethanol fueled SI engine with variable valve timing. (2012). minesparis-psl.hal.science. https://minesparis-psl.hal.science/hal-00738666v1

Effect of Graphene Oxide Addition on Spark Ignition Engine Performance and Cycle-to-cycle Variation with Gasoline-ethanol Fuel
2026
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Agama, A. A., Auzani, A. S., Madsuha, A. F., Hermawan, H., Kurniawan, A., & Mokhtar, M. (2026). Effect of Graphene Oxide Addition on Spark Ignition Engine Performance and Cycle-to-cycle Variation with Gasoline-ethanol Fuel. doi.org. https://doi.org/10.31603/ae.14237

Encyclopedia Of Agriculture And Food Systems
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Encyclopedia Of Agriculture And Food Systems. (n.d.). archive.org. https://archive.org/details/Encyclopedia_Of_Agriculture_And_Food_Systems

encyclopedia-of-science-and-technology-mc-graw-hill
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encyclopedia-of-science-and-technology-mc-graw-hill. (n.d.). archive.org. https://archive.org/details/encyclopedia-of-science-and-technology-mc-graw-hill

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