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General E46 Forum
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Old 08-25-2012, 06:57 PM   #101
jdstrickland
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USE WHATEVER YOU WANT, but before you settle in on 87, keep track of the mileage you get, then use 91 for several tanks of gas and also keep track of the mileage you get.

If you get improved fuel mileage with the 91, then it might be CHEAPER to use that instead of 87.

In my area, 91 costs $0.20 more than 87, but the mileage improvement is more than 3mpg. The cost per mile is actually cheaper with the 91 than it is with 87, and this means that fuel costs are lower with the more expensive gas.

If you get 87 that costs $3.70, and get 20mpg, then your cost per mile is $0.185. If you bought 91 for $3.90 but it gave you 23mpg, then your fuel cost per mile is only $0.169. This is just over $0.015 less per mile. If you drove 15,000 miles per year, then the fuel savings with the more expensive gas would be $225.00. You have to run your own numbers, but your car is DESIGNED to take 91, but it tolerates 87 by making adjustments to the timing that correct the problems that the lower octane causes. Your car will appear to run "just fine" on 87, but if you kept track of what the mileage was, and then drove the same route with 91 and kept track of the mileage, you would find that the mileage improvement is easily 3mpg, and perhaps more. If the mileage improvement was only 2mpg, you would still save $120 per year on 15,000 miles. You cannot have a higher fuel cost with premium UNLESS you get less than 1.5mpg improvement, and that little improvement still gives a $60.00 savings over 15,000 miles.
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Old 08-25-2012, 07:01 PM   #102
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Lol, not this again. Our bimmer is still running strong and averaging 28 mpg on 87. Come at me.
I have averaged 29-30 on long road trips running Shell 91. I have a steptronic.
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Old 08-25-2012, 07:54 PM   #103
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I have averaged 29-30 on long road trips running Shell 91. I have a steptronic.
If I only get 29-30, I'll lose money on the switch.
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Old 08-25-2012, 10:08 PM   #104
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European BMW's run on 91 octane gas or higher becuase of how BMW tuned them. they"ll knock if you dont. In the us our engines are de-tuned to run on lower octane fuel so its totally fine unless you have an EU2 tune
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Old 08-25-2012, 10:19 PM   #105
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If I only get 29-30, I'll lose money on the switch.
What's your secret?
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Old 08-25-2012, 11:14 PM   #106
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What's your secret?
91 octane being $0.30 more than 87.

That and keeping the car well maintained so that it runs as efficiently as possible
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Old 08-25-2012, 11:58 PM   #107
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my 323 runs happily on 87. it loves me
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Old 08-26-2012, 02:13 AM   #108
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my 323 runs happily on 87. it loves me
Please keep doing this, so there is one less 323 on the road for some kid to buy and try to run 20in wheels on it.
Seriously, your car will run on 87 octane, but it is constantly retarding the timing to compensate. This reduces power, and you need every bit you can get with a 323. The only upside of running 87 is that you can go inside and get a large slushy rather than a small one. It is a stupid way to save money, and not something to brag about.
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Old 08-26-2012, 07:50 AM   #109
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Please keep doing this, so there is one less 323 on the road for some kid to buy and try to run 20in wheels on it.
Seriously, your car will run on 87 octane, but it is constantly retarding the timing to compensate. This reduces power, and you need every bit you can get with a 323. The only upside of running 87 is that you can go inside and get a large slushy rather than a small one. It is a stupid way to save money, and not something to brag about.
Lol. So 87 destroys cars now?
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Old 08-26-2012, 08:26 AM   #110
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I used 87 on my 323 for couple of years and ran just fine... didnt skip a beat. Once in a while I gave it a 93 when ever I crossed the border.

You guys in US pay less to fill up with 93 then we do with 87.... its actually cheaper for me to drive down one hour to fill up in Port Huron and come back home then it is to fill 87 locally.... thats ****ing crazy!!

As for my 330, I put in 91 90% of the time... I think I felt a placebo effect with 87..... thanks Fanatics!!!!!

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Old 08-26-2012, 11:27 AM   #111
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Seriously, can we just shut up about the octane ratings? Your car will NOT explode running 87, it will get slightly worse MPG and performance, thusly for most people it's worth ponying up for the higher octane stuff. If you don't want to, fine, it won't hurt your car. If you think it will, you're stupid, stop trying to infect everyone else with your false information.

Now please, /thread
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