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7 Series - F01 / F02 (2009 - current)
The new re-designed 7 series F01 / F02 leads off the BMW Fxx chassis code!

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  #1  
Old 04-25-2012, 03:10 PM
RVD RVD is offline
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89 octane?

i always use premium unleaded gas (91 octane around here) but i noticed that my car gas cap sticker says to use a minimum of 89 octane.

can i get away with using 89 octane gas? i don't get any knocking or anything but i haven't tried 89 yet. is it worth trying it out to see if i get any engine knocking, etc.?

car is a 2012 750i activehybrid.
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  #2  
Old 04-25-2012, 11:22 PM
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csmeance csmeance is online now
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Does it clearly state 89 Octane? I've thought it said USE PREMIUM FUEL ONLY which equates to 91+ octane...

As far as damage goes, since the car is turbo-charged I'd use the best gas I can find. If it was a non-turbo car and it had low compression ratios then regular would be fine. In all honesty you are saving about 2.50 if you buy 25 gallons of gas. Not much of savings there...

Last edited by csmeance; 04-25-2012 at 11:24 PM.
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  #3  
Old 04-26-2012, 10:41 AM
RVD RVD is offline
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So it says both...use unleaded gas premium and then underneath it says minimum octane 89.
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My long, crazy, picture/video filled ED delivery from 2/2012: http://www.bimmerfest.com/forums/sho...941&highlight=

2012 750i AH - Imperial Blue, Oyster and Black Nappa, Driver Assist Package, Sirius. ED: 2/27/2012 Dropped Off: 3/1/2012 Ready for Pick Up: 4/13/2012, Actual Pick Up: 4/16/2012

2009 BMW 128i Convertible

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2003 Mercedes Benz E320
1996 Ford Explorer XLT
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  #4  
Old 04-26-2012, 11:16 AM
chrischeung chrischeung is online now
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Mein Auto: 2012 ActiveHybrid 7 SWB
Per the manual:

Super premium gasoline/AKI 91
This gasoline is highly recommended.

Gasoline with lower AKI
However, you may also use gasoline with less AKI.
The minimum AKI Rating is 89. If you use gasoline with this minimum AKI Rating, the engine may produce knocking sounds when starting at high outside temperatures.
This has no effect on the engine life.

I think 89 is fine if you want.
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3/12 ED 7 - thread ID 610350
1/11 ED 6 - thread ID 5767556&postcount=175
4/10 ED 5 - thread ID 453501
5/08 ED 4 - thread ID 290679
3/07 ED 3 - thread ID 201013
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  #5  
Old 08-02-2012, 03:35 AM
Virginia Guy Virginia Guy is offline
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Mein Auto: 2012 335i convertible
Smile tried 89 vs 91 octane

I drive a 2012 BMW 335i convertible, LeMans Blue with Saddle Brown leather and M trim, and love it. Iíve had it seven months and have already logged 20K miles. Obviously I do mostly highway miles to have logged so much so quicklky.

As an experiment, I tried both premium and midgrade gas. Here are the results according to the car's trip computer:

=> I drove 1,000 miles on premium gas (91 octane), achieved 24.7 MPG, so that means I consumed 40.5 gallons.

=> I then drove 1,000 miles on midgrade (89 octane, the minimum required per the gas cap) and received 24.2 MPG, thus consumed 41.3 gallons.

I suspect the difference of 0.5 MPG less for midgrade is so small that itís statistically insignificant and could be the extra gas consumed from one traffic jam or a rural byway going over mountain.

Anyway, assuming a 20 cent difference in cost between midgrade and premium, from these data it only cost about $8 more per 1,000 miles to use the premium. From that perspective, itís not much money - but Iím still not sure it adds any performance or value.

On the other hand, I drive at least 30K miles per year so this adds up to $240 year - enough for two nice dinners out with my wife. Even so, you donít buy a cool sports car to save money. Although I was originally thinking Iíd use midgrade and save money on the car, the data above have convinced me to stick with premium in the hope that it will add something positive to the carís health in the long term, which for me is always 150K to 250K miles on a car.

BTW, see this Mythbuster note about gas:

http://www.nicoclub.com/archives/gas...ane-myths.html
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  #6  
Old 08-02-2012, 11:13 AM
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Lease or purchase? That should answer the question.
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  #7  
Old 08-02-2012, 11:26 AM
chrischeung chrischeung is online now
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I lease almost exclusively. And I always use premium. I don't want any issues and time off the road, even if it's a few dollars more each fill up.
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2012 ActiveHybrid 750i ED

3/12 ED 7 - thread ID 610350
1/11 ED 6 - thread ID 5767556&postcount=175
4/10 ED 5 - thread ID 453501
5/08 ED 4 - thread ID 290679
3/07 ED 3 - thread ID 201013
3/06 ED 2 - thread ID 136454
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  #8  
Old 08-02-2012, 01:43 PM
Gundo Gundo is offline
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More hp with higher octane. Modern knock sensors retard spark timing when lower octane present, so choice is yours. Lower octane = lower performance. If car is delivering everything you need at 89 octane, keep calm and carry on.
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  #9  
Old 08-02-2012, 02:03 PM
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Individual750LI Individual750LI is offline
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Actually I am thinking since our car is turbo charged, maybe putting in 100 octane will increase the HP. But don't have the guts to do it.

But to the topic, I always put in 91 octane when it's recommended by the manufacture, why bother to take the chance of engine damage with loss in performance, as well as worse gas mileage? It's not worth it with minimum saving.
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  #10  
Old 08-02-2012, 03:07 PM
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07X3platinum 07X3platinum is offline
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Yeah, Gundo is right. As an example, if you go to Hyundai's website and look at the detailed specs of the 4.6 Genesis sedan it specifically says it gets 385hp with Premium, but only 378hp with Regular fuel.
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