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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 04-23-2008, 05:15 PM   #21
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It actually sickens me to think that all of these people on this forum are running less than 91 octane. Please let everyone know when you are ready to sell your car; and clearly post that you have been running that B.S. gas in it for every fill-up. I bet you no one would want it unless you were offering a crazy discount!

Dunbar...You have an 04 330 ZHP! I can't believe that you would put the worst gas you can get in such a beautiful machine like that. As the others have stated...the link you posted says to run on manufacturers specifications and BMW manual says 91+ octane; so you just bit your own tongue on that one....

You guys are crazy for trying to save money this way...Just sell the Bimmer and get an Accord then...It will leave money left in your pocket and you can put ANY gas you want in it!!!
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Old 04-23-2008, 05:24 PM   #22
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Like I said lots of misinformation and ignorance out there on this subject. I prefer scientific testing to anecdotes and folklore. But hey, it's your money, waste it how you please...
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Old 04-23-2008, 05:30 PM   #23
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Hate to tell you guys this but I have been running regular gas in my car for the last 160,000 miles and yet to have a problem. MY car currently has 200,000 miles and runs like a champ. It purrs like a kitten no pinging either.

Oh by the way I get 32mpg on the highway and 24-6 in mixed driving.

I have tried premium gas weeks at a time and saw no noticeable difference in the performance or engine noise or mileage.

Anyone who says your engine will run like crap and will get horrible gas mileage is full of crraaaaaap. If you are willing to pay 15-30 cents extra per gallon to get 1-2 extra hp out of your engine by all means go ahead and spend your money. I am a car nut and I love the speed and power but if I cant feel a difference, I am not blowing my money away. If you think that your precious BMW engine is designed for 91 octane and will crap out with anything less, try going to other countries. BMW sells worldwide and you would be lucky to get a quality gas with 91 octane in other countries. BMW designs their engines to run in all countries with less than ideal gas quality. 87 octane here would be a top notch gas in some other countries.

Again you can argue until the forum database craps out but in the end I have the proof in my garage. 200,000 miles with regular gas, NO ENGINE PROBLEMS, NO KNOCKING AND GREAT PERFORMANCE SO FAR. You can't argue with facts. As far as I am concerned Premium gas is nothing but a marketing gimmick for cars less than a Porsche. It is just a way of making BMW, LEXUS, MB owners feel special. Especially when you take in the fact that Lexus and Toyota camry uses the same engine and Lexus requires premium and Camry regular.

Unless you have high compression engine, running super/turbo charger or have a chip installed Premium gas will only save you mileage by reducing the weight of your car by lighting your wallet.

I remember reading a test for Premium gas making extra 9-11hp for a Porsche 911S which has a very high compression engine. If it only makes 10hp for a 350hp car that has 11:8 compression ratio, do you really think it will add 5-10 hp in your 220hp cars? You are lucky if you get 2 hp which you can gain by getting rid 10-20 lbs of junk in your car(buy a light battery, remove junk from the truck, better remove the full spare tire) .
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Old 04-23-2008, 05:41 PM   #24
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I put in 91. My readings say 387 but I probably average around 320 depending on how conservative I drive.
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Old 04-23-2008, 06:00 PM   #25
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I should have calculated the difference when I pumped 87 Costco gas into my 335i loaner. Should be getting another one about next week during my Inspection II. I'll subscribe and let you know
Dude, someone is going to buy that car someday, don't be a dick. The car has a turbo so it needs the premium to help fight off detonation ANYWAY, and to compound that I'm SURE you're beating on it. They were nice enough to give you a loaner, put ****ing 91 in it. I hope they drop a handful of nuts and bolts into your oil fill hole.
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Old 04-23-2008, 06:15 PM   #26
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My question did not have anything to do with the price of gas

or the octane.

I simply wanted to know if you got better gas milage out of the premium grade over the mid or regular grades.

That's all. Not engine problems, HP loss, etc.....


And if I could'nt afford gas........I would'nt be driving ANYTHING.
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Old 04-23-2008, 06:31 PM   #27
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Originally Posted by sean96gsr View Post
Dude, someone is going to buy that car someday, don't be a dick. The car has a turbo so it needs the premium to help fight off detonation ANYWAY, and to compound that I'm SURE you're beating on it. They were nice enough to give you a loaner, put ****ing 91 in it. I hope they drop a handful of nuts and bolts into your oil fill hole.
+1 You can only hope that what goes around comes around..
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Old 04-23-2008, 06:32 PM   #28
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R E A L L Y

My question did not have anything to do with the price of gas

or the octane.

I simply wanted to know if you got better gas milage out of the premium grade over the mid or regular grades.

That's all. Not engine problems, HP loss, etc.....


And if I could'nt afford gas........I would'nt be driving ANYTHING.

R E A L L Y

How does grade of gas have nothing to do with octane? How old are you?

Your question was answered.

It depends on how you drive. If you put your engine under high load, it will want to detonate and the knock sensors will tell the computer to retard the timing resulting in lowered efficiency and power.

If you're cruising on the highway under low load, then 87 should result in the same efficiency as 93 octane.

Learn to
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Old 04-23-2008, 06:39 PM   #29
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Originally Posted by sean96gsr View Post
Dude, someone is going to buy that car someday, don't be a dick. The car has a turbo so it needs the premium to help fight off detonation ANYWAY, and to compound that I'm SURE you're beating on it. They were nice enough to give you a loaner, put ****ing 91 in it. I hope they drop a handful of nuts and bolts into your oil fill hole.
+1
super dick move
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Old 04-23-2008, 06:42 PM   #30
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This topic has been relentlessly beaten to death.

I'm a fan of the "If you can't afford the extra $3 at the tank, why'd you get a BMW?"

But I also can see the "Even if I drive a BMW, I still shouldn't throw money away."

My personal thoughts:

Its an extra $3 a tank...twice a month for me.

$6 a month, $72 a year...granted gas prices freeze, which they wont. But numbers will be similar

I'll put premium and have the peace of mind.
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Old 04-23-2008, 06:56 PM   #31
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I'm lucky, here in Ohio all the stations have 93, and some have 94. I have never used anything but that gas, though my friend's Mercedes runs like crap on regular and is very smooth on premium. I mean, literally, the idle is unstable, it chokes on acceleration, everything. This was the one time he put 87 in on accident (the station's buttons were reverse from all the other ones around here and he wasn't paying attention), and he makes sure not to anymore. We had to go get that "high power octane booster" and put like 6 cans in the gas tank for it to even get somewhat better. They say octane booster doesn't work, but I guess 6 cans did something.
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Old 04-23-2008, 07:28 PM   #32
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Quote:
Originally Posted by gokcer View Post
Hate to tell you guys this but I have been running regular gas in my car for the last 160,000 miles and yet to have a problem. MY car currently has 200,000 miles and runs like a champ. It purrs like a kitten no pinging either...
This is true, but your car has not been running at its OPTIMUM level for the last 160k miles! Your computer is retarding your timing and giving you less power and overall worse efficiency...You seem like the type of person that will cut corners to save a buck ALL THE TIME. Like for instance...you have a custom K&N instead of buying a proper kit (which in all fairness is a good install judging from the pics). You also have like 20 advertisements in your sig which you are probably trying to get kick-backs off of to give you more money...So your advice will be taken with a grain of salt (or not taken at all in my instance)!

BUT, to each their own...I know gas; and I know there is a difference in the feel of almost any car from 87 octane to 93 octane (which I use all the time before and after installing the shark injector).
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Old 04-23-2008, 07:34 PM   #33
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The higher the price of gas the less the 20-25 cent difference there is between regular and premium gas.

As for using regular, go ahead and use it if you have no choice, it won't hurt your car in anyway.

But if you are doing it to save money, then don't. You won't save any money in the life of a tank of gas. When you factor the decrease in mpg, you will break even at best, and get less hp while doing it.

Use premium, you won't save any money going with regular.
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Old 04-23-2008, 09:53 PM   #34
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come on...you drive a bmw and you can't afford gas? You bought a BMW...if you can't afford it ...get a Hyundai or yugo.
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Old 04-23-2008, 10:06 PM   #35
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BMW is programed to run on 91 or better. This is where you get the best gas millage when you average driving habits/highway/local.

Having said that ECU can also sense the fuel type based on various sesor information...but takes little time to learn. Running on regular and driving on highway (cruising) it has no effect in performance or millage that would be greatly noticed...but when you want to pass that slow Semi and you need to shift down, the engine will consume more gas to make up the needed power.

As for demage to the engine...none whatsoever. Just because it is "premium" it does not mean it is refined better...these are just octane ratings.

The car that is programed to run under octane 91 it will perform better gas millage, the car that is programed for over 91 (or whatever rating) it will performed better at that point as it does not have to "learn" what fuel is running on.

The only damage you will do with fuel to your BMW is if you put gas that has more than 10% ethanol. Up to 10% ethanol BMW engines are fine with it. BMW states that if you put more than 10% ethanol there are certain components that will not work well with 90% ethanol (probably seals, sensors, fuel pump components) but it says otherwise the ECU would adapt itself if it wasn't for those components at the expense of burning little more fuel (less power with ethanol).
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Old 04-23-2008, 10:07 PM   #36
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speaking from an experience, i definitely would not recommend you doing it nor to anyone else.

here is why... i had used mid-grade gas for about 6 months, and after a while, fuel filter went bad and it cost me almost 300 to replace it. and i'm sure that you can do the math to figure out whether i saved or wasted $ because of it.
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Old 04-23-2008, 10:36 PM   #37
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speaking from an experience, i definitely would not recommend you doing it nor to anyone else.

here is why... i had used mid-grade gas for about 6 months, and after a while, fuel filter went bad and it cost me almost 300 to replace it. and i'm sure that you can do the math to figure out whether i saved or wasted $ because of it.
OT: You paid $300 for a new FUEL FILTER??? The part is like $30 and can be done by an independent mechanic in less than half an hour, so that's like $25-35 in labor. WOW.
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Old 04-23-2008, 10:48 PM   #38
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Does anyone know which national gas station chains sell 91 octane? All I can find in West PA is 87 Regular, 89 Silver/Premium, and 93 Gold/Ultra.

We used to have Sunoco's here that sold Ultra in 94, but now it is just 93. I used Amoco Gold (93) exclusively in my 99 Maxima, but occasionally put Sunoco Ultra 94 in it. I am sure it made a seat of the pants difference.

Now I use either Amoco 93 or Sunoco 93 in the Maxi and '04 325XI - thus the question; Where can I find 91 in West PA? Thanks!
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Old 04-23-2008, 11:13 PM   #39
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come on...you drive a bmw and you can't afford gas? You bought a BMW...if you can't afford it ...get a Hyundai or yugo.
read before posting...if you had you would have found a reply by the OP that reads:

Quote:
Originally Posted by BB BMW View Post
R E A L L Y

My question did not have anything to do with the price of gas

or the octane.

I simply wanted to know if you got better gas milage out of the premium grade over the mid or regular grades.

That's all. Not engine problems, HP loss, etc.....


And if I could'nt afford gas........I would'nt be driving ANYTHING.
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Old 04-23-2008, 11:32 PM   #40
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I usually use 89/91 (91 is the highest here I can get)...although the sticker behind the gas lid says minimum octane my car can use is 87...
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