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89 octane (10% ethanol) VS 91 octane (no ethanol)

6.9K views 10 replies 6 participants last post by  05silverhemimag  
#1 ·
Just a question about using different fuels, just want to see if anyone has tried this before.

Anyways, the Husky/Mohawk gas station has a 89 octane gas for regular, with 10% ethanol. The Shell has 87 octane as regular (with 10% ethanol), but they also have 91 octane as premium (12¢/L more than regular) with NO ethanol in it. (The mid-grade at the shell is 89 octane with 5% ethanol) The premium at the Husky is 93 octane with 10% ethanol.

So my question is, would it be cheaper to run 91 octane premium with no ethanol and have the 91 octane tune than running the car stock and with the 89 octane with ethanol? I know I could just get a programmer and try out a couple tanks, but I just want to see if anyone has tried this before and what their results were.
 
#2 ·
Hey Drag,
I live in colorado and it has been my experience that performance drops off when you start to use fuel with ethanol blended in. My mpg goes down by about 2. I have also heard that ethanol attracts water, so you may end up with very small water in your tank and fuel lines. Not sure if theres any truth to it so i always stay away from it if i can!
 
#3 ·
I, personally, won't use anything that contains ethanol! JMO!
 
#5 ·
Jester,
alot of stations are switching to fuels that have some ethanol blended in, but they are supposed to list those fuels at the pump. The problem is that most stations just dont care and may or may not let you know. I know you will pay more for non-ethanol blends here in colorado, but more stations are buying ethanol blends only because they are cheaper and you don't know the difference. I put heet, gas tank and fuel line additive in whenever i have to use ethanol blends. heet is supposed to keep fuel lines from freezing(which we have to worry about here, sometimes) and also supposedly removes water. It's cheap, like $1.50 a bottle. I also use lucas fuel stabilizer($9 and some change at walmart) at every fill up, my wife thinks i'm crazy for putting all these additives in, but since they aren't making magnums anymore gotta make the one i have last!
 
#8 ·
Jester,
alot of stations are switching to fuels that have some ethanol blended in, but they are supposed to list those fuels at the pump. The problem is that most stations just dont care and may or may not let you know. I know you will pay more for non-ethanol blends here in colorado, but more stations are buying ethanol blends only because they are cheaper and you don't know the difference. I put heet, gas tank and fuel line additive in whenever i have to use ethanol blends. heet is supposed to keep fuel lines from freezing(which we have to worry about here, sometimes) and also supposedly removes water. It's cheap, like $1.50 a bottle. I also use lucas fuel stabilizer($9 and some change at walmart) at every fill up, my wife thinks i'm crazy for putting all these additives in, but since they aren't making magnums anymore gotta make the one i have last!
I already add lucas, and once a season I run Seafoam. I do the SeaFoam becasue blends change for the season and I travel so much that each state has different refining standards for fuel. but asside from that, nothing else. but I did not know that you can buy fuel without ethanol in it. I will be looking for that for now on.
 
#9 ·
At the local shell stations, for regular it says "up to 10% ethanol". Mid-grade it says "Up to 5% ethanol", and for the Premium Shell "V-power" it says "contains no ethanol". All 3 grades are 2 octane lower than what the Husky advertises, and they have ethanol in all of their fuels.
 
#10 ·
Ethanol will bump the octane rating, here regular unleaded is 87, regular with 10% ethanol being 89 octane. I also heard that with all this green energy crap coming down the pipe, they want to make all gasoline blended with 18% minimum. And that will be coming straight out of the refinery with ethanol added before it leaves the plant. So essentially, no matter how much we love our cars and want to treat them right, they will force ethanol down our throats whether we want it or not!