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Old 09-24-2009, 08:16 PM   #1
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87 vs. 89

89 octane is like 9 cents cheaper here than 87 i asked why and the owner said its has ethanol in it is that good or bad or neutral

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Old 09-24-2009, 09:02 PM   #2
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Re: 87 vs. 89

nearly all gas of all octanes have 0-10% ethanol nowadays. i heard mixed opinions about it. some say its bad, but i havent seen substantial proof that its THAT bad for the car.

it does give slightly less gas mileage though.... from what i hear.

if i had to choose between something that had less or more ethanol, id choose the one with less... unless there was an outrageous price gap between the two.

we've all been driving with ethanol mixed in for quite some time now, so dont be too alarmed by it.


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Old 09-24-2009, 09:08 PM   #3
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Re: 87 vs. 89

Yah, I've heard mixed opinions about ethanol levels as well. I agree with wiarumus, If I'm given the option to use a fuel with less ethanol, I do it.

By me for example, a local Citgo has the regular unleaded/premium pumps on the left side of the store, and the diesel pumps on the right side. One of the diesel pumps feeds 87 octane with no ethanol.

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Old 09-24-2009, 10:01 PM   #4
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Re: 87 vs. 89

For the most part a combustion engine can run on anything that, well, combusts. I remember watching something about Chrysler's Jet Engine powered car which would run on anything combustive: gasoline, methanol, whiskey/vodka and even perfume. Of course the power between a jet engine and a internal combustion engine are quite different, you do have people that convert there cars to run on methanol or ethanol.

Now the different molecular structures will produced varied results such as fuel economy, engine power, point of ignition, and many other things.

I think the biggest downfall to the ethanol additive (or conversion) is that cars have not been designed for ethanol. In the last few years automakers have acknowledged this market by producing a line of vehicles for this flex fuel. Sound familiar? GM has their flex fuel line and Ford has the Flex which have the option to run on high percentages of ethanol (85%+). Now the whole ethanol movement is a conversation piece all in itself.

Now not that the 10% most states carry is going to blow your engine, but components of the car was not designed for ethanol. For specifics the fuel lines - plastics and rubbers that come in contact with ethanol, the ethanol tends to ruin these compounds.

Personal example is the gas gaskets that are leaking, like on my car now. Now this may or may not be the problem, but on my behalf it is an educated guess on my own car.

Summary: Ethanol is neutral although it has its own pros and cons.
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