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<blockquote data-quote="NightShade" data-source="post: 3347831" data-attributes="member: 29706">Alcohol burns with almost no flame because it carries an extra O2 molecule so even though it may have less energy per gallon than pure gasoline it will generally help the fuel burn more completely.&nbsp; Way too many people claim major drops in economy which is technically not possible.&nbsp; Even just looking at pure mathematical BTU and not actual test data which will run a little higher because of the alcohol acting as an oxidizer the change in BTU isn&#039;t as much as the fuel economy drops claimed which some people say is as high as the percentage of ethanol in the fuel.&nbsp; I actually have a spreadsheet I messed around with that shows the percentage change and expected changes in MPG based on only the mathematical BTU difference.&nbsp; Most people who see changes larger than that are being heavy footed throwing their results off even if doing so unconsciously.&nbsp; [ATTACH=full]158802[/ATTACH] </blockquote>

[QUOTE="NightShade, post: 3347831, member: 29706"] Alcohol burns with almost no flame because it carries an extra O2 molecule so even though it may have less energy per gallon than pure gasoline it will generally help the fuel burn more completely. Way too many people claim major drops in economy which is technically not possible. Even just looking at pure mathematical BTU and not actual test data which will run a little higher because of the alcohol acting as an oxidizer the change in BTU isn't as much as the fuel economy drops claimed which some people say is as high as the percentage of ethanol in the fuel. I actually have a spreadsheet I messed around with that shows the percentage change and expected changes in MPG based on only the mathematical BTU difference. Most people who see changes larger than that are being heavy footed throwing their results off even if doing so unconsciously. [CENTER][ATTACH=full]158802[/ATTACH] [/CENTER] [/QUOTE]

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