What Octane Fuel?

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I run 93 in everything for the lawn mower to the 4runner everything seam to run better and the run will get about 60 miles non corrected fuel mileage
 
I've run 85, 87 and 91 in my 4runner. I have never noticed any power or mpg differences. It doesn't ping on 85 so that is what I run 99% of the time.
 
I run 87. They offer 89 with the ethanol out here for cheaper but I don't trust ethanol. Not enough regulation on what percentage of ethanol your getting from the pump. That and ethanol, if left to sit will attract water.
 
The lower octane fuels (e.g., 85) are only valid for higher elevations because the air is thinner so you're technically not getting the same compression as you would at lower elevation, hence no pinging/pre-detonation. That being said, the only advantage you would ever get from a fuel above 87 octane is perhaps a cleaner fuel (by chance) or maybe lower amounts of ethanol mixed in... ethanol actually doesn't have the same efficiency as gasoline.

So, anyway, I'd go 87 if you live in IN...
 
87 most of the time. I'm told, unless the person on the pump before you bought 93, the first two gallons or so of your 93 purchase are going to be lower octane anyway because the lines are full of the cheaper gas the last guy used anyway. I've run higher octane in my other cars when called for but my 4R does fine on 87.
 
Gerdo said:
I've run 85, 87 and 91 in my 4runner. I have never noticed any power or mpg differences. It doesn't ping on 85 so that is what I run 99% of the time.
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My actions exactly. But here is NC, gas comes 87, 89, Some Gas stations offer 91 and some off 93. Not sure how this works.


Dous said:
93 in mine, I would run 87 if I could
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Have you tried 91 or 89 for that matter?


I have some customers that work at the oil terminals and they told me a little secrete. All the gas for NC comes from Texas through underground pipe line. They only pipe 3 fuels. Regular, Super and Diesel. Ethanol is railed in from the midwest via tanker cars and is blended at the terminal. Your local gas station mixes super and regular at the pump to offer Mid-grade gas.

In NC - all gas stations sell the same gas. From the same pipe line. The different store brands (Hess, Shell, Exxon, Mobil and etc) have their own additives which they add to the Tanker truck before shipping to the gas station.

I buy my gas from Walmart because it is usually 10 cents cheaper and it does not have all the additives in it.


Side note. With my 4.7 swap, I ran super (91 or 93 depending the pump) for the first 5,000 miles. Then I braved up and tried some regular and my 4runner gets the same milage as before. No knocking or pinging so this is all I run now.
 
PitbullRescuer said:
87 most of the time. I'm told, unless the person on the pump before you bought 93, the first two gallons or so of your 93 purchase are going to be lower octane anyway because the lines are full of the cheaper gas the last guy used anyway. I've run higher octane in my other cars when called for but my 4R does fine on 87.
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This is not true if the pump has separate nozzles for each grade.


When I fill up my Truck, When the pump stops, I insert the nozzle back into the pump to turn it off, i then put the nozzle back into my tank and drain all the gas out of the hose. Once all the gas is drained from the hose, I put the nozzle back into the pump.

I usually get a couple of cups of Gasoline out of it.:driving:
 
T4RFool said:
I run 87. They offer 89 with the ethanol out here for cheaper but I don't trust ethanol. Not enough regulation on what percentage of ethanol your getting from the pump. That and ethanol, if left to sit will attract water.
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Doesn't matter where you are, all gas in the US has at least 10% ethanol in it.

Aviation gas is ethanol free but has lead in it so not good for Cat equipped vehicles.
 
I used to run 93, but with the price increase over the years, I have scaled back to 89. I have found that the 4runner has run best with Sunoco 89 grade in it. The worst? BP by far.

For long commutes and trips, I still use 93. I seem to get more miles out of a tank than with either 89 or 87.

I don't understand why there is such a great price gap between 87 and the rest of the fuels grades now. It used to be about 10 cents, give or take a few pennies. Not now by far. If anyone has any input for such, I'd love to know.
 
Ive been running 89 lately. I hear pinging at higher RPMs on 87. Start up seems to take a few more cranks in the morning...
 
Singtoe said:
Doesn't matter where you are, all gas in the US has at least 10% ethanol in it.

Aviation gas is ethanol free but has lead in it so not good for Cat equipped vehicles.
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There are some stations around that sell non-oxegenated gas, but they're getting harder to come by. My 1975 Yamaha DT250 does not like ethanol and I try not to put any in there, but that either means I hunt down a non-oxegenated station or put in 93+ (because that often means it doesn't have ethanol).
 
I've thought my 3rz to run best on Sunoco as well littlecaeser. Mine does run best on premium it seems. I think it may be related to the P0240 code I've been running on for the last 50k miles.
 
Next time you guy a new piece of lawn equipment look at the owners manual it will tell you not to run anything low than 93 in them the reason is because of the 10% corn that is in the gas. I spoke to the people I buy equipment from about it. The guy said they have been having a lot if equipment come back burned up and I guess a few years back Stihl start putting the on low than 91 in the books I can say all my stuff runs better and fired up the first pull
 
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