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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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Old 09-17-2013, 09:25 PM
TripPhillips TripPhillips is offline
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Premium Vs Regular unleaded gasoline

Hi,
I am in a dilemma, I have a 2006 BMW 325i and my mom just realized I have been putting the extra $5 in my car to get the recommended Premium grade fuel I believe my car needs, but my Mom doesnt want to pay the extra +$20 to fill my car up 4 times a month on premium. My dad doesnt really care but you know how it is, the mom usually wins the arguments. I offered to pay the difference but my mom wont let me. I really don't I mean don't want to put regular in my car since i have heard it can take up to 10% of my car's power away. I was just wandering what the real affects would be on my car and if it would even be safe to use low grade fuel in my car.
Thanks
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  #2  
Old 09-17-2013, 09:40 PM
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Nordic_Kat Nordic_Kat is offline
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How many times do you stop at Starbucks in a month? How many times does your mom stop at Starbucks?

Eliminate just 5 trips to Starbucks in one month and you will have paid for the premium vs regular differential.

To really understand what you car needs, read the placard inside the gas filling port. It will tell you explicitly what grade of gasoline is the minimum recommendation.

If you don't believe it, do a search here on the forum. It will keep you reading for literally days.
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Old 09-17-2013, 11:48 PM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by TripPhillips View Post
I am in a dilemma, I have a 2006 BMW 325i and my mom just realized I have been putting the extra $5 in my car to get the recommended Premium grade fuel I believe my car needs, but my Mom doesnt want to pay the extra +$20 to fill my car up 4 times a month on premium. My dad doesnt really care but you know how it is, the mom usually wins the arguments. I offered to pay the difference but my mom wont let me. I really don't I mean don't want to put regular in my car since i have heard it can take up to 10% of my car's power away. I was just wandering what the real affects would be on my car and if it would even be safe to use low grade fuel in my car.

An excellent lesson for you, TP. You'll find that though girls may be up for adventure, splurging on Premium included, women of experience may have strong opinions. If fact, at about 50 years of experience, some opinions become law if you want to keep peace in your family.

So. Just roll with it. Regular won't hurt your car, only performance. 'Whether 'tis nobler....' -- you get the idea.
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Old 09-18-2013, 12:24 AM
anE934fun anE934fun is offline
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Quote:
Originally Posted by TripPhillips View Post
Hi,
I am in a dilemma, I have a 2006 BMW 325i and my mom just realized I have been putting the extra $5 in my car to get the recommended Premium grade fuel I believe my car needs, but my Mom doesnt want to pay the extra +$20 to fill my car up 4 times a month on premium. My dad doesnt really care but you know how it is, the mom usually wins the arguments. I offered to pay the difference but my mom wont let me. I really don't I mean don't want to put regular in my car since i have heard it can take up to 10% of my car's power away. I was just wandering what the real affects would be on my car and if it would even be safe to use low grade fuel in my car.
Thanks
Cliff-Notes version is that the ECU in combination with knock sensors will know when pre-ignition (aka knock) is occurring, and will dial back ignition timing to stop the knock. Dialing back the ignition timing will reduce the power output of the engine. Worst case, when you press the go pedal, your engine acts like it lost 50 hp and doesn't respond to your press on the go pedal. Is that worth the extra $20/month? Your call.
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Old 09-18-2013, 08:04 AM
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Déja Vù thread, or is this just a monthly Bimmerfest thing?
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Old 09-18-2013, 08:11 AM
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Old 09-18-2013, 08:47 AM
Steel609 Steel609 is offline
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Personally I see an increase in gas mileage of up to 50 miles per tank while using premium vs regular unleaded. That alone should win your argument.
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Old 09-18-2013, 09:06 AM
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pistolpuma pistolpuma is offline
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Car and Driver did a test a while back with cars running regular that required premium and vice versa. The conclusion was anywhere between 5 and 10% drop in performance and mileage, depending on car, when dropping from premium to regular. You can probably Google the article.

I also experimented a few years ago by running regular in my Nissan Pathfinder for a month. I found that I lost over 10% in MPG whereas the differential in price between premium/regular was only about 5%. No pinging. Non-scientific, but my conclusion was that it was false economy. The difference I saved at the pump was lost, and then some, by decreases in MPG and performance.

Last edited by pistolpuma; 09-18-2013 at 09:08 AM.
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Old 09-18-2013, 09:51 AM
Steel609 Steel609 is offline
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Another solution - put regular unleaded in your tank so your mom is happy when she sees the bill each month and then pick up some octane booster to reach premium levels and slip in your tank each fill up.
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Old 09-18-2013, 09:56 AM
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Premium Vs Regular unleaded gasoline

Seriously, what is up with people buying premium brands when they can't afford or don't want to pay for the associated costs?

Feed the car what manufacturer said to.


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Old 09-18-2013, 09:56 AM
KeithinCA KeithinCA is offline
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I've been curious about this exact topic and appreciate the chatter. I have an 01 540 6 speed and have put 2 tanks of regular. I just realized, by reading this post why I am going through so much gas and have a slight loss in power. I forgot that the car compensates for the lack of octane, but I think I will spend 'the extra $5 a week' for more get up and go and better gas mileage.

Thanks for helping me make up my mind.
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  #12  
Old 09-18-2013, 09:58 AM
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Find a convenient filling station that offers a discounted cash price. Ask for your fuel allowance in cash so that you may take advantage of the savings. Kick in the additional cost for premium out of your own pocket. Impress Mom with your frugality, make yourself & your car happy...problem solved.

(If Mom demands receipts, go with the solution offered in post #6. )
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Old 09-18-2013, 09:58 AM
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Premium Vs Regular unleaded gasoline

Quote:
Originally Posted by thekurgan View Post
Déja V***249; thread, or is this just a monthly Bimmerfest thing?
No, this is actually a weekly thing. No one likes using the search button. I'm all for posting threads looking for help, but not one that has been beaten to death so hard...


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Old 09-18-2013, 10:00 AM
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I'm all for posting threads looking for help, but not one that has been beaten to death so hard...
Yeah but this time around, Mom is involved. That puts a totally new spin on the topic.
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Old 09-18-2013, 10:12 AM
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Keepittrill Keepittrill is offline
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Premium Vs Regular unleaded gasoline

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Yeah but this time around, Mom is involved. That puts a totally new spin on the topic.
LOL
True, this is somewhat new!

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Old 09-18-2013, 12:48 PM
BashedBarrique BashedBarrique is offline
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Originally Posted by Keepittrill View Post
LOL
True, this is somewhat new!

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I think the OP should take his question to the Momfest forum website.
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Old 09-18-2013, 12:59 PM
anE934fun anE934fun is offline
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Originally Posted by Steel609 View Post
Another solution - put regular unleaded in your tank so your mom is happy when she sees the bill each month and then pick up some octane booster to reach premium levels and slip in your tank each fill up.
Octane boosters are not going to bump up the octane to premium territory. This is another well-worn topic on BF. At most, you are going to get .1 - .3 increase in octane rating from boosters and the boosters cost way more than adding premium in the first place.
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Old 09-18-2013, 01:29 PM
TripPhillips TripPhillips is offline
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Premium Vs Regular unleaded gasoline

Yeah I offered to pay the difference with my own money, but my mom won't let me. It is super gay. I think my dad is going to talk to her about it


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Old 09-18-2013, 01:32 PM
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Yeah I offered to pay the difference with my own money, but my mom won't let me. It is super gay. I think my dad is going to talk to her about it


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Old 09-18-2013, 01:43 PM
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Premium Vs Regular unleaded gasoline

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Yeah I offered to pay the difference with my own money, but my mom won't let me. It is super gay. I think my dad is going to talk to her about it


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Old 09-18-2013, 01:51 PM
Rahulk Rahulk is offline
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Premium Vs Regular unleaded gasoline

You can run regular 87. You might lose 10 hp (215 to 205) but you don't see that unless you Erving it like crazy.

I've done close to 200,000 miles in my e90 325i and have run regular most of the time... Now if this car was a turbo, then you're screwed, you'd have to use premium... As for mpg I'm averaging 27.3 mpg per the BC. I'm not complaining....


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Old 09-18-2013, 02:15 PM
fdriller9 fdriller9 is offline
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You don't save any money by using 87 vs 91. Your DME will retard timing and various other engine parameters to work with the lower octane. This decreases performance and also decreases fuel economy.

The $20 your mother thinks she saves, is lost by decreased fuel economy.
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Old 09-18-2013, 07:44 PM
Roleez Roleez is offline
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If your mommy says use regular and her name or your daddy's is on the registration, it is their car, so do as they say. If your name is on the registration, supreme is the choice, provided the money or credit card swipe came from money you earned on your own paycheck.
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Old 09-18-2013, 07:59 PM
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Premium Vs Regular unleaded gasoline

Man, wtf? This Thread again?
Like cereal, buy a Honda if you can't afford Premium gas =_=!


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Old 09-19-2013, 04:45 AM
hondo402000 hondo402000 is offline
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so move out of the house, support yourself and then you wont have to listen to your mom, but then wait till you get a girl friend who wants to go out every night and says that extra 20 buck you waste on gas you can waste on me

either way you loose
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