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      04-14-2014, 03:36 PM   #23
E90Fleet
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Use of lower octane fuel will cause the ECU to pull timing from the engine to prevent knocking, lowering power output and possibly increasing gas usage.
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      04-14-2014, 10:16 PM   #24
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Originally Posted by E90Fleet View Post
Use of lower octane fuel will cause the ECU to pull timing from the engine to prevent knocking, lowering power output and possibly increasing gas usage.
Exactly. You said it in fewer words than I did. I just don't understand why someone would pay twice the price for a car than they really need to, then try to save a buck, maybe a buck and a half on a fill up. It won't hurt anything if you have to use lower octane, or accidently use it, but I just don't understand why someone would do it willingly. All that money spent for a high performance vehicle, then dial it back and get less performance and less gas mileage...
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      04-29-2014, 06:51 AM   #25
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I just use the green one (diesel) and there aren't any options for grade.
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      04-29-2014, 02:01 PM   #26
S1OOORR
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Quote:
Originally Posted by MysticBlue View Post
Exactly. You said it in fewer words than I did. I just don't understand why someone would pay twice the price for a car than they really need to, then try to save a buck, maybe a buck and a half on a fill up. It won't hurt anything if you have to use lower octane, or accidently use it, but I just don't understand why someone would do it willingly. All that money spent for a high performance vehicle, then dial it back and get less performance and less gas mileage...
i think you may misread the headline of this thread, I don't think anyone here mention putting below the recommended octane in their vehicle. A question was asked to see if 89 was being used by other X35 owners and 91. Now I'm not taking your post personal but everything i buy i try and save a buck even when i purchase my vehicle and gas. I'm pretty sure when you purchase your vehicle you tried to save a buck off the MSRP unless you just have money falling out of your pockets. Anyway back to the fuel on your gas cap if you haven't seen it. 89 was recommend as the minimum so my question is do you work for BMW to say the least that if a person puts the minimum recommend fuel in 89 will hurt performance i don't think so, if they told you to put 95 in the tank if there was a 95 will you just because they told you, or you will go with lower octane recommended by BMW. I get it 93 = performance yadda ya i mean who are you racing, is your vehicle on a track being race yeah then i will go with the higher octane for the performance, now if its every day driving 89 won't hurt. My thing is if its mention that you can use 89 whats the problem BMW telling you that its safe to use 89 what the problem really, its not the matter someone being cheap cause we all have BMW`s. Lets face it the truth some places the gas prices are outrageous i use 93 since i had my vehicle, even during refueling i look for the nearest gas station for the cheapest 93 it may just be me but if a gas station near me has 93 for 4 bucks even I'm not going to the one up the block for 4.10. You can't get rich or save money by throwing every buck you have away or cents. Just my thoughts enjoy your vehicle.
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      04-29-2014, 03:27 PM   #27
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Quote:
Originally Posted by S1OOORR View Post
i think you may misread the headline of this thread, I don't think anyone here mention putting below the recommended octane in their vehicle. A question was asked to see if 89 was being used by other X35 owners and 91. Now I'm not taking your post personal but everything i buy i try and save a buck even when i purchase my vehicle and gas. I'm pretty sure when you purchase your vehicle you tried to save a buck off the MSRP unless you just have money falling out of your pockets. Anyway back to the fuel on your gas cap if you haven't seen it. 89 was recommend as the minimum so my question is do you work for BMW to say the least that if a person puts the minimum recommend fuel in 89 will hurt performance i don't think so, if they told you to put 95 in the tank if there was a 95 will you just because they told you, or you will go with lower octane recommended by BMW. I get it 93 = performance yadda ya i mean who are you racing, is your vehicle on a track being race yeah then i will go with the higher octane for the performance, now if its every day driving 89 won't hurt. My thing is if its mention that you can use 89 whats the problem BMW telling you that its safe to use 89 what the problem really, its not the matter someone being cheap cause we all have BMW`s. Lets face it the truth some places the gas prices are outrageous i use 93 since i had my vehicle, even during refueling i look for the nearest gas station for the cheapest 93 it may just be me but if a gas station near me has 93 for 4 bucks even I'm not going to the one up the block for 4.10. You can't get rich or save money by throwing every buck you have away or cents. Just my thoughts enjoy your vehicle.

Yes, 89 will not hurt your engine

On a hot day at sea level will it produce its full rated power with 89, probably not.

But on a very cold night at 6,000 feet above sea level it may produce full power on 89 ( though these turbo engines are more sensitive to octane ratings than the normally aspirated ones and probably need minimum 91 even in these conditions)


If you want the full performance figures from your engine (power and consumption) at any regular altitude and temperature, use the highest octane you can get.


Dont care about getting full performance and wanting to save a bit on gas, get 89.

(US octane figures quoted, not euro type)
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      04-29-2014, 04:05 PM   #28
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91 because if gas prices were an issue I wouldn't have purchased an $85k suv that gets 11mpg lol! I also want maximum performance.
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