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What Octane do you normally use? [message #235804] Sat, 11 January 2014 08:40 Go to next message
Clark76 is currently offline  Clark76   United States
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Octane Rating[ 21 votes ]
1. 85 Octane 1 / 5%
2. 87 Octane 16 / 76%
3. 89 Octane 2 / 10%
4. 91 Octane 0 / 0%
5. 93 Octane 2 / 10%

When you are on the road, what octane fuel rating do you normally fill up with at the pump? The assumption is you normally look for non-ethanol gas first.

[Updated on: Tue, 11 February 2014 10:25]

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Re: [GMCnet] What Octane do you normally use? [message #235830 is a reply to message #235804] Sat, 11 January 2014 11:56 Go to previous messageGo to next message
Gary Berry is currently offline  Gary Berry   United States
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I always use 87 pump gas. 7-8 mpg towing (always towing something). Usually
a lot of mountains to go over when we travel. Usually run 25 to 30 mph
going up 6% grades. Never in a hurry anymore...

--
Gary and Diana Berry
73 CL Stretch in Wa.
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Re: What Octane do you normally use? [message #235846 is a reply to message #235804] Sat, 11 January 2014 15:22 Go to previous messageGo to next message
Matt Colie is currently offline  Matt Colie   United States
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I rarely see 85 in the places we go. But if I saw anything that was real gasoline, I would buy that first.

Matt


Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
Re: What Octane do you normally use? [message #235854 is a reply to message #235846] Sat, 11 January 2014 17:13 Go to previous messageGo to next message
LarryInSanDiego is currently offline  LarryInSanDiego   United States
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85 is common at the higher altitudes in NV that I've seen. Nothing higher than 89 up there (high range along hwy 318, up to ~7000').

Larry Engelbrecht San Diego, CA '73 26' ex-Glacier TZE063V100319 03/07/73
Re: What Octane do you normally use? [message #235863 is a reply to message #235854] Sat, 11 January 2014 18:19 Go to previous messageGo to next message
cadelec is currently offline  cadelec   Australia
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where is the check box for 98 octane

Trevor Brisbane Australia Siesta Koala 76 Edgemont (old Bobby Moores) 71 Cadillac Eldo Convert 58 Cadillac Eldorado Brougham Project
Re: What Octane do you normally use? [message #235865 is a reply to message #235863] Sat, 11 January 2014 18:48 Go to previous messageGo to next message
Loffen is currently offline  Loffen   Norway
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cadelec wrote on Sun, 12 January 2014 01:19

where is the check box for 98 octane


And no 101 octane ?? Americans... Very Happy

Here you could get 92 octane at some stations, the normal gas we use is 95 and 98 octane and we have some stations with 101 octane. But ok I will be honest, the european octan rating is about 3 points higher than the simular US gas and I have no idea how it is down under.


1973 23' # 1848 Sky Blue Glacier called Baby Blue and a 1973 26'-3 # 1460 Parrot green Seqouia Known as the Big Green, And sold my 1973 26'-2 # 581 White Canyon lands under the name Dobbelt trøbbel in Norway
Re: What Octane do you normally use? [message #235872 is a reply to message #235804] Sat, 11 January 2014 19:27 Go to previous messageGo to next message
chasingsummer is currently offline  chasingsummer   United States
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87 octane,
before installing the upper end oiler I ran pure gas only.


brian asheboro, nc 75 eleganza, 74 build 119k miles and counting, DOG HOUSE
Re: What Octane do you normally use? [message #235881 is a reply to message #235872] Sat, 11 January 2014 20:18 Go to previous messageGo to next message
LarryInSanDiego is currently offline  LarryInSanDiego   United States
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I run the lowest octane I can use as long as it doesn't detonate. Octane is the rating of detonation resistance only. Typically, the higher the octane rating, the lower the energy content( BTUs/gallon, etc.). Seems foolish to spend more money for a lower performing fuel that gets consumed at a faster rate. If you're not running high compression or artificially aspirated, there's no valid reason to run high octane with low compression engines. If it's detonating, that's either an engine management issue or there's carbon buildup.

The only things that'll blow up an engine (besides improper parts/assembly/clearances) are:

1) insufficient lubrication,
2) excessive speed,
3) overheating,
4) detonation/preignition

Btw, John Meaney of EFI fame tunes his 1300 hp sbc Corvette on 87 octane. Combustion chamber design of the heads he uses is a key factor.


Larry Engelbrecht San Diego, CA '73 26' ex-Glacier TZE063V100319 03/07/73
Re: [GMCnet] What Octane do you normally use? [message #235885 is a reply to message #235865] Sat, 11 January 2014 21:09 Go to previous messageGo to next message
Ronald Pottol is currently offline  Ronald Pottol   United States
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Well, your gas is Research Octane Number (ron), ours is (r+m)/2 that's
measured octane, which is lower.

I can get 100 octane here, but it's 2x as much.

Plato seems wrong to me today.
On Jan 11, 2014 4:48 PM, "Espen Heitmann" <bimet@online.no> wrote:

>
>
> cadelec wrote on Sun, 12 January 2014 01:19
> > where is the check box for 98 octane
>
>
> And no 101 octane ?? Americans... :d
>
> Here you could get 92 octane at some stations, the normal gas we use is 95
> and 98 octane and we have some stations with 101 octane. But ok I will be
> honest, the european octan rating is about 3 points higher than the simular
> US gas and I have no idea how it is down under.
> --
> 1973 26' Parrot green Seqouia in Norway
> "Loffen" translates to white bread, it is also a nick name for your.. well
> you know..down there.. and it was my dog's name, but hey you can also call
> me Espen ;)
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> Unsubscribe or Change List Options:
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1973 26' GM outfitted
Re: [GMCnet] What Octane do you normally use? [message #235892 is a reply to message #235865] Sat, 11 January 2014 21:34 Go to previous messageGo to next message
USAussie is currently offline  USAussie   United States
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G'day,

You really need to follow the Octane number with the rating method (RON or MON) or you're not comparing apples to apples.

http://en.wikipedia.org/wiki/Octane_rating

Regards,
Rob M.
Sydney, Australia

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Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426
Re: [GMCnet] What Octane do you normally use? [message #235906 is a reply to message #235885] Sat, 11 January 2014 23:29 Go to previous messageGo to next message
cadelec is currently offline  cadelec   Australia
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thanks for the clarification i have to remember that there will always be an apparent difference across the waters

Ronald Pottol wrote on Sat, 11 January 2014 21:09

Well, your gas is Research Octane Number (ron), ours is (r+m)/2 that's
measured octane, which is lower.

I can get 100 octane here, but it's 2x as much.

Plato seems wrong to me today.
On Jan 11, 2014 4:48 PM, "Espen Heitmann" <bimet@online.no> wrote:

>
>
> cadelec wrote on Sun, 12 January 2014 01:19
> > where is the check box for 98 octane
>
>
> And no 101 octane ?? Americans... Very Happy
>
> Here you could get 92 octane at some stations, the normal gas we use is 95
> and 98 octane and we have some stations with 101 octane. But ok I will be
> honest, the european octan rating is about 3 points higher than the simular
> US gas and I have no idea how it is down under.
> --
> 1973 26' Parrot green Seqouia in Norway
> "Loffen" translates to white bread, it is also a nick name for your.. well
> you know..down there.. and it was my dog's name, but hey you can also call
> me Espen Wink
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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Trevor Brisbane Australia Siesta Koala 76 Edgemont (old Bobby Moores) 71 Cadillac Eldo Convert 58 Cadillac Eldorado Brougham Project
Re: [GMCnet] What Octane do you normally use? [message #235916 is a reply to message #235892] Sun, 12 January 2014 04:55 Go to previous message
Loffen is currently offline  Loffen   Norway
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Yes Rob you are right and I was not so far off when I said "the european octan rating is about 3 points higher than the simular US gas" , from wiki :

Difference between RON and AKI

Because of the 8 to 10 point difference noted above, the octane rating shown in Canada and the United States is 4 to 5 points lower than the rating shown elsewhere in the world for the same fuel. This difference is known as the fuel's sensitivity,[4] and is not typically published for those countries that use the Anti-Knock Index labelling system.

Robert Mueller wrote on Sun, 12 January 2014 04:34

G'day,

You really need to follow the Octane number with the rating method (RON or MON) or you're not comparing apples to apples.

http://en.wikipedia.org/wiki/Octane_rating

Regards,
Rob M.
Sydney, Australia

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1973 23' # 1848 Sky Blue Glacier called Baby Blue and a 1973 26'-3 # 1460 Parrot green Seqouia Known as the Big Green, And sold my 1973 26'-2 # 581 White Canyon lands under the name Dobbelt trøbbel in Norway
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