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why do some states have only 91 octane gas?

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Old Sep 23, 2009 | 11:29 AM
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From: prattville alabama
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why do some states have only 91 octane gas?
and which states are they?
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Old Sep 23, 2009 | 12:15 PM
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I know CA and NV have 91
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Old Sep 23, 2009 | 12:33 PM
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They have the 91 for the reason to reduce emmisions. So before fill up just stop by the plane, get a gallon of Av Gas then mix it with pump gas, take that tree huggers Or add some octan booster
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Old Sep 23, 2009 | 01:57 PM
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Originally Posted by pmknapp
They have the 91 for the reason to reduce emmisions. So before fill up just stop by the plane, get a gallon of Av Gas then mix it with pump gas, take that tree huggers Or add some octan booster
Funny you should say that. In the mid 70's I used to drive a '66 Mustang worked to the max. I used to put 3/4 tank of ethel at my local gas station then drive to the local private airport and fill her up with AV Gas. Then go drag racing. That engine screamed and you could see the fuel gauge go down.
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Old Sep 23, 2009 | 02:31 PM
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AZ is another with 91. You can get 100 oct race fuel so I mix approx 22 percent race gas in to arrive at a 93 octane.
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Old Sep 23, 2009 | 02:57 PM
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Originally Posted by azlane
AZ is another with 91. You can get 100 oct race fuel so I mix approx 22 percent race gas in to arrive at a 93 octane.
That seems like kind of a pain in the butt.
Last edited by dmyrick; Sep 23, 2009 at 03:01 PM.
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Old Sep 23, 2009 | 03:48 PM
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Yeah, I have to agree it is less than ideal. For now I am ok putting in 3-4 gallons because I like the way the car performs with higher octane.
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Old Sep 23, 2009 | 06:52 PM
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96 and 08 911 turbos
keep in mind that race fuel has a different stoich a/f ratio.

You might be better off adding torco.
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Old Sep 23, 2009 | 07:01 PM
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Originally Posted by pmknapp
They have the 91 for the reason to reduce emmisions. So before fill up just stop by the plane, get a gallon of Av Gas then mix it with pump gas, take that tree huggers Or add some octan booster
AVgas from what I thought was usually leaded.
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Old Sep 23, 2009 | 07:44 PM
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Originally Posted by azlane
AZ is another with 91. You can get 100 oct race fuel so I mix approx 22 percent race gas in to arrive at a 93 octane.
LOL.... I do the same thing. I fill up 4 gallons of VP 103 and rest of the tank with 91. When I'm at the track, I sometimes mix half and half.
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Old Sep 24, 2009 | 03:08 AM
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2012 E63 PP, 2012 Ferrari 458, 2012 Boxster S
Octane 95 and Octane 98 are the only options in Europe.

But then again we pay almost 3 x price.

Ken
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Old Sep 24, 2009 | 09:22 AM
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96 and 08 911 turbos
you also have a different measuring system. I believe yours is RON, where as in the US, its Ron+Mon/2
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Old Sep 24, 2009 | 09:45 AM
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Originally Posted by Oliverk
you also have a different measuring system. I believe yours is RON, where as in the US, its Ron+Mon/2
Thanks. Your comment animated me to check http://en.wikipedia.org/wiki/Octane_rating

I stand educated

Ken
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Old Sep 24, 2009 | 10:59 AM
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Originally Posted by dmyrick
and which states are they?
You can't thank all the loons of the Left who only motive is to tear this country down.
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Old Sep 24, 2009 | 03:29 PM
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Originally Posted by KEMA
That's a good example of why Wikipedia isn't allowed as a credible reference in academic research.

The "Regional variations" section completely ignores the (sizable and bound to grow rapidly as the 2016 fuel economy averages start ramping up steeply) market segment which has boosted engines.

Update: I sent a note making the point that forced induction systems need to be addressed when discussing the acceptability of reducing engine octane rating requirements at higher altitudes. Plus the argument is based on dated carburetor technology.
Last edited by MB_Owner; Sep 24, 2009 at 04:17 PM. Reason: Update
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Old Sep 24, 2009 | 05:12 PM
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There are 3 things in AZ that makes driving miserable:

1) 91oct gas
2) Altitude
3) Heat in the summer

Combine all three and you realize how much power you are losing.
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Old Sep 24, 2009 | 06:12 PM
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a quarter mile at a time
Originally Posted by C63newdude
There are 3 things in AZ that makes driving miserable:

1) 91oct gas
2) Altitude
3) Heat in the summer

Combine all three and you realize how much power you are losing.


On a hot summer day you can feel a SIGNIFICANT difference in power.
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Old Sep 24, 2009 | 06:18 PM
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Yes
Originally Posted by pmknapp
They have the 91 for the reason to reduce emmisions. So before fill up just stop by the plane, get a gallon of Av Gas then mix it with pump gas, take that tree huggers Or add some octan booster
Originally Posted by chubbs032
AVgas from what I thought was usually leaded.

100 LL (poorly named because it is NOT a low lead fuel), and 140 are BOTH leaded fuels. I'm sure it was a joke, but DO NOT put av gas in any fuel injected car that still uses O2 sensors...

Av gas is great for a high compression injected car that has a no O2 sensor tune; or an older carbed vehicle...but it's a sure trip to the parts store for anything using an O2 sensor!
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