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12-28-2012, 07:33 AM | #26 | |
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Anyways, we can see that people have different opinions on the matter. There's really no best seasons for tuning. I have done it in all 4 seasons and it's really not easier or harder to do it in one vs. the other.
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12-28-2012, 07:39 AM | #27 |
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That is possible. The stickers in the gas station say "up to 10%" ethanol. We could be getting 10% or 5% or 1%. Perhaps we get more ethanol in the mix in winter months and the content drops in summer. I tried to look for this info but it's not easily found. No one at the station can even point me in the direction of where to go to find out. I think the best way to know is to take a sample and test it and do it on periodic basis to find out what's really in it. Another thing to think about, as corn prices rise and ethanol becomes more expensive to produce, I imagine gas producers may cut the blend down to keep the prices from rising too much. I am sure they're under pressure to keep it as low as possible. May have an effect on how much is added to the mix.
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12-28-2012, 10:19 AM | #28 |
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There is definitely a difference in the winter blend and the summer blend gasoline. Most of the formulational changes are to help cold start by varying the fuels vapor pressure and the ease that it atomizes in colder winter temps.
No matter how expensive ethanol is its still cheaper than the gasoline based additives that would be substituted if that 10% mixture of E wasn't used. I doubt the rising cost of E has anywhere near the effect on gas prices as much as the rising cost of crude oil. |
12-28-2012, 01:19 PM | #29 |
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I would lean more towards the winter blend fuels likely having a lower ethanol content than the summer fuels, due to ethanols inability to burn correctly at low temperatures.
Look at how many E85 guys convert back to 93 octane in the winter... It would also explain why I've been seeing MORE knock since the winter fuels really kicked in! |
12-28-2012, 06:13 PM | #30 | |
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There's your precise answer. Last edited by ProfessWRX; 12-28-2012 at 06:46 PM. |
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12-30-2012, 08:54 AM | #31 | |
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Anyways, one way to find out: http://www.fuel-testers.com/ For academic reasons, I am thinking about picking up a kit and doing a once a month sampling of my local Shell station that I usually gas up at. The place was built very recently so I am hoping it does not suffer from long term exposure and contamination. |
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01-01-2013, 07:22 PM | #32 | |
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01-01-2013, 07:27 PM | #33 | |
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