Gas recommended for MCS - Page 13 - North American Motoring


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Gas recommended for MCS

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  #301  
Old 12-15-2012, 02:46 PM
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Ugh I accidentally put regular (87) in my car last night. LUCKILY it's below 40*F and I have the GP TMIC to aid in cooling. I am trying to burn thru this tank ASAP.

No bad side effect but DEFINITELY doesn't have the pull it usually does. You can really feel the reduced timing.

I'm an idiot.
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  #302  
Old 12-15-2012, 03:40 PM
Capt_bj Capt_bj is offline
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once you are down a half .. top off with the right octane - do this a few times and your overall tank octane will be restored.

The alternative is to run your current tank to fumes but I prefer the other plan. And until you DO bring your tank octane up .... have a soft foot. You'll get better MPG!
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  #303  
Old 12-15-2012, 05:15 PM
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Quote:
Originally Posted by Capt_bj View Post
once you are down a half .. top off with the right octane - do this a few times and your overall tank octane will be restored.

The alternative is to run your current tank to fumes but I prefer the other plan. And until you DO bring your tank octane up .... have a soft foot. You'll get better MPG!
Yeah I was gonna do that at a 1/4 tank, but that's gonna take me foreeeeeever to do. The MCS is my secondary car/ garage queen. I drove one the hwy last night only burned a 1/4 down.
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  #304  
Old 02-17-2013, 10:13 AM
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Although it's "safe" to do I suppose, there is definitely a noticeable decrease in power AND gas mileage when using just 89 octane. I think it's less efficient to try and skim by with a lower fuel grade rather than using the recommended fuel grade...

Why would you buy the 'S' if you're not going to drive it like it was meant to be driven!
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  #305  
Old 02-17-2013, 01:50 PM
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very simply EVERYTHING BMW manufactures (yes including MINI S and Base) require 91 oct. If you look at the cost you are only talking less than $2 per tank. Small price to pay.
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  #306  
Old 02-18-2013, 07:56 AM
DailyDrivenMini DailyDrivenMini is offline
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Quote:
Originally Posted by MCS 5 View Post
Ugh I accidentally put regular (87) in my car last night. LUCKILY it's below 40*F and I have the GP TMIC to aid in cooling. I am trying to burn thru this tank ASAP.

No bad side effect but DEFINITELY doesn't have the pull it usually does. You can really feel the reduced timing.

I'm an idiot.
Not sure if those octane boosters work but go pick up a bottle of octane booster from auto part store and put it in the tank. If it does what it is supposed to do, then you have a tankful of corrected octane rated gasoline. No reason to run around with lower octane then.
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  #307  
Old 03-24-2013, 02:39 PM
JCW401 JCW401 is offline
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I would use and additive as said above and add it at a gas station using premium to mix it in.
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  #308  
Old 08-22-2013, 09:19 PM
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I'm a new Mini owner, but here in NM my only option for higher octane fuel is 90. However there is a station near my house that offers Non-Ethanol Premium so thats what I have been running.
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  #309  
Old 08-22-2013, 09:54 PM
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I used to live in Denver, CO and the highest we had was 91. We had the lower than say 92/93 that you see on the east cost due to our elevation of 5280 or higher depending where you are. I would imagine that you are in the same situation. It would be one thing if only one station had the lower but it sounds like most have 90. I would try one tank and see if you see a change . Of course the higher the better but in a pinch I would not worry.

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I'm a new Mini owner, but here in NM my only option for higher octane fuel is 90. However there is a station near my house that offers Non-Ethanol Premium so thats what I have been running.
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  #310  
Old 08-23-2013, 08:06 PM
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We are at 7000FT here, but most stations do have 90. So I will run that until I find myself in BFE NM, and my only choice is 87. NM is extremely rural you know, but that what I like about it.

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Originally Posted by CraigATL View Post
I used to live in Denver, CO and the highest we had was 91. We had the lower than say 92/93 that you see on the east cost due to our elevation of 5280 or higher depending where you are. I would imagine that you are in the same situation. It would be one thing if only one station had the lower but it sounds like most have 90. I would try one tank and see if you see a change . Of course the higher the better but in a pinch I would not worry.
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  #311  
Old 08-24-2013, 07:39 AM
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The gentlemen from CAR TALK say that 87 octane won't hurt an MCS. It was in today's local paper
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  #312  
Old 10-20-2013, 07:30 PM
MaybeMCSC MaybeMCSC is offline
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While much of the discussion here has been about what octane to use, I didn't see that much about ethanol.

When I had my 2011 CM, seemed like there were more folks advocating the use of "pure" gas (ethanol-free), but still with the correct octane.

I have a couple of "pure" gas stations sort of near me, but boy, it is premium-priced! I paid about $.30 more per gallon for my "pure" 93 octane! (I'm comparing premium "pure" to premium with ethanol here.)

Any current evidence as to the benefit or lack thereof of running "pure" gas?

Thanks in advance!

Last edited by MaybeMCSC; 10-20-2013 at 07:31 PM. Reason: explanation of price comparison
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  #313  
Old 12-21-2013, 07:35 PM
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ethanol boosts octane but lowers the energy of the fuel. Strange eh?

I would kill for a 30 cent per more pure non ethanol gas station.
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  #314  
Old 12-29-2013, 05:05 PM
minimike1! minimike1! is offline
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I only use marine grade 90 octance unleaded. A bit more expensive but it runs so smooth without the corn fuel I'll never go back.
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  #315  
Old 12-29-2013, 05:06 PM
minimike1! minimike1! is offline
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I only use 90 grade marine fuel in mine. It runs so smooth!
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  #316  
Old 12-29-2013, 05:24 PM
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ethanol boosts octane but lowers the energy of the fuel. Strange eh?

not if you understand what octane means . . . or IS

Octane makes the fuel HARDER to ignite !!!! INCONCEIVABLE!!!!!
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  #317  
Old 11-10-2014, 12:25 PM
busemans busemans is offline
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if you are super worried about accidentally putting mid or regular in your tank, MCS 5, you can always head down to the local airport and put a few gallons of 100LL in it. that will bring you right back to being good. the octane booster will also, though.
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  #318  
Old 01-07-2015, 11:12 AM
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We just bought our 04 R50 with 130K on odometer and 3/4 of a tank of unknown gas. It took forever to run it down. It did not seem happy and I don't know if it was just older gas - the car had been sitting for over a month on a car lot - or lower octane or just ethanol junk. The car had a slight intermittent miss but I finally got some hi-test and a bottle of Techron in her and it maybe seems better. I've already put new plugs in and checked the wires for corrosion - found none. The plugs I pulled out read great. I think she happier with the higher octance as my manual recommends.
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  #319  
Old 01-16-2015, 03:59 PM
fastzombie fastzombie is offline
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I never run anything less than super. I ran 89 a few times and you could notice much more pinging under acceleration. Maybe just psychological but I feel better running my local 93 all the time.
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  #320  
Old 04-20-2017, 02:47 PM
Thumper Simpson Thumper Simpson is offline
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Quote:
Originally Posted by hugh View Post
Kaelaria...patience!!!

Peeple Puleeze !!! Calulator time:

Drive 20,000 miles per year.

Get 25 mpg (hopefully better but...)

That's 800 gallons of petrol.

Here in NJ, premium is 10 cent per gallon more than mid range.

That comes out to $80 per year!:smile: :smile:

Did ANYONE pay less than $20,000 out-the-door for their car?

Is $20080 THAT MUCH MORE?

HS
yes. $4300.
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  #321  
Old 04-20-2017, 02:49 PM
Thumper Simpson Thumper Simpson is offline
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Quote:
Originally Posted by Tab32 View Post
Although it's "safe" to do I suppose, there is definitely a noticeable decrease in power AND gas mileage when using just 89 octane. I think it's less efficient to try and skim by with a lower fuel grade rather than using the recommended fuel grade...

Why would you buy the 'S' if you're not going to drive it like it was meant to be driven!
Around here, 91 octane is 60 cents higher than 89 octane.
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  #322  
Old 07-16-2017, 10:19 AM
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In both my mcs I have only run 91, that's because I had a turbo Audi that I tried to be cheap on an it cost me $5000 to repair the engine damage!
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  #323  
Old 08-08-2017, 02:43 AM
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I didn't even realize it was a premium engine when I got mine (2005 R50).

I ran it for ~10,000 miles on regular 87 octane fuel - then one day saw the sticker on the fuel door saying "Premium 91 octane only". I immediately switched over and...

There has been absolutely no difference. Gas mileage - same. Power - same. Engine noise - same. Still, it is the fuel the engine was designed to use, so I don't mind paying a couple bucks extra. I still get about 36 to the gallon, so I'm not complaining.

- Ald
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