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don't have an FJ yet, but in Colorado and other altitude states, they have 85, 87, and 91 octane available....so maybe 85 octane could be an option?
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One other reason I post this question is that we have been seeing shortages in my area for mid and premium. So I'm hoping to run premium or mid grade but it's good to know it can run on 87 if that's all that is available.
So far I see most run 87 octane, interesting...is there any harm going from premium to 87? In particular would this cause any type of injector damage or O2 sensor damage? I've never changed octanes, so I don't know the issues going from one octane down or up to another.
Well, my opinion is, 87 suppose to get you more mPG than higher octane, so i dont know how he's getting more mpg on 91 than the 87. Higher octane has lot more cleaning agent and octane and less actual fuel. But greater combustion... so some newer cars need the higher octane for greater combustion otherwise the check engine light will come on and knocking and pinging occurs. I'm not sure if the FJ needs that higher combustion.
So i've heard...
One other reason I post this question is that we have been seeing shortages in my area for mid and premium. So I'm hoping to run premium or mid grade but it's good to know it can run on 87 if that's all that is available.
So far I see most run 87 octane, interesting...is there any harm going from premium to 87? In particular would this cause any type of injector damage or O2 sensor damage? I've never changed octanes, so I don't know the issues going from one octane down or up to another.
No Harm. The engine will correct for the lower octane. It will be interesting to see if you notice a performance difference. Remember that the higher octane gasoline remaining in your tank when you fill up will blend with the 87 octane added to top off the tank. So if you have 4 gallons of 91 octane when the light comes on and add 15 gallons of 87 octane, the resultant mixture will be 87.8 octane. The reverse is true for those that decide to fill up with 91 octane after running 87. This is actually a simplified blending calculation, but the complex one won't change the answer within the tolerances used here. So your really need to go through a couple tanks of the new octane if you want to used to conduct a personal assessment.
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For the most part I am running 87...maybe it is my imagination, but there seems to be a little different engine note and I can't quite hear the nice exhaust sound as well (no I don't have the TRD exhaust)...so actually a little "quieter" on 87 than 91.
That said, I have used a couple of tanks of 91 (we ran out of 87 at my local BP two weeks ago and now we are out of mid and premium at the same BP, go figure) including the one that came from the dealer [I watched him fill it with premium on our test drive]. Overall I am averaging a little of 18 MPG in mixed driving and on mixed fuel grades.
Oops...forgot some important information
4X4 Auto, Roof Rack (still have to get some shims to stop the rattling)
No Harm. The engine will correct for the lower octane. It will be interesting to see if you notice a performance difference. Remember that the higher octane gasoline remaining in your tank when you fill up will blend with the 87 octane added to top off the tank. So if you have 4 gallons of 91 octane when the light comes on and add 15 gallons of 87 octane, the resultant mixture will be 87.8 octane. The reverse is true for those that decide to fill up with 91 octane after running 87. This is actually a simplified blending calculation, but the complex one won't change the answer within the tolerances used here. So your really need to go through a couple tanks of the new octane if you want to used to conduct a personal assessment.
Thanks for the input! Some of the stations in my area are out of mid and premium which is why I am a little concerned. I know the shortage is mostly due to the change in agents which requires the tanks to be cleaned before they are refilled, hence the reason we are seeing a shortage. I wanted to make sure it would be ok to fill with regular should I find no stations that have mid or premium.
I'll try to stick with premium unless I'm forced to regular or mid grade, so far I've found that if I drive around I can find a station which has mid and premium, by the time my FJ arrives the shortage should "hopefully" be near an end. As far as price, I don't mind paying a little extra to have the engine last longer...I plan on keeping the FJ for a VERY long time!!! Hell, my uncle's FJ is over 25 years old running strong! (no issues either)
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