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Old 10-12-2022, 07:48 PM   #28 (permalink)
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I don't think additives affect mpg, they are very miniscule in concentration. I don't think the difference can come from ethanol either, because E10 is capped at 10%. However a lot of lighter aliphatic hydrocarbons do have much lower density and can be blended in to produce gasoline that has lower energy density, but they would need to keep the RVP down, so there are limitations too.
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