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Chevron is now 85 octane?? #4046133 03/22/16 05:29 PM
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cb4017 Offline OP
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I filled my car at the local Chevron today (Northern Nevada) and was surprised to see the 87 octane labels were now 85 octane labels. Not something I expected to see with a top tier gas. Is this becoming the norm?


Cliff
USN Ret., FPD Ret.
Re: Chevron is now 85 octane?? [Re: cb4017] #4046141 03/22/16 05:39 PM
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What elevation were you at? Higher elevation needs less octane.

Re: Chevron is now 85 octane?? [Re: cb4017] #4046142 03/22/16 05:40 PM
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Well, it's different by location what "regular" "midgrade" and "premium" mean, so it's the norm, but it isn't the new norm.
The difference has to do with elevation whether regular is typically 83 or 85 or 87 or something else entirely.


Last edited by raytseng; 03/22/16 05:40 PM.
Re: Chevron is now 85 octane?? [Re: cb4017] #4046147 03/22/16 05:42 PM
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85 octane is the norm at higher elevations.

Re: Chevron is now 85 octane?? [Re: cb4017] #4046154 03/22/16 05:45 PM
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cb4017 Offline OP
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We're at about 4,000 altitude. Around here regular gas has normally been 87 octane. Mid 89 and high octane 91. Now at this Chevron it's 85, 88 and 91. I'm going to look around and see what the other brands are doing.

I'll probably buy other brand now.


Cliff
USN Ret., FPD Ret.
Re: Chevron is now 85 octane?? [Re: cb4017] #4046170 03/22/16 06:12 PM
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Chris142 Offline
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Thats weird. But our premium is only 91. Some of our toys take 93+


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Re: Chevron is now 85 octane?? [Re: cb4017] #4046188 03/22/16 06:40 PM
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Originally Posted By: cb4017
We're at about 4,000 altitude. Around here regular gas has normally been 87 octane. Mid 89 and high octane 91. Now at this Chevron it's 85, 88 and 91. I'm going to look around and see what the other brands are doing.

I'll probably buy other brand now.


Why? Less dense air means less air being squeezed in the cylinders=less power and heat. Less heat means a lower octane requirement because ignition detonation is less. So lower elevation locations require more octane and higher elevations require less.


make the inside of your engine oil cap white.
don't use.
Re: Chevron is now 85 octane?? [Re: cb4017] #4046213 03/22/16 07:12 PM
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I've spent quite a bit of time travelling through Utah which mostly is above 4000 feet above sea level. Because the air is less dense, your effective compression ratio is lower than at sea level and therefore the need for higher octane is also reduced. Almost all the stations I've used (even in St. George at 2,800 feet) are 85, 87, and 91 octane respectively. And if by chance you find yourself driving to lower elevations with 85 octane in your tank, modern computer controlled vehicles will alter the ignition timing to prevent detonation (at a loss of overall efficiency and power). I understand this is normal in Colorado as well, but I wouldn't know for sure.

With a normally aspirated engine, I wouldn't be too concerned. I ran my old 2005 Silverado all around Utah, Northern Arizona, and up through Nevada and 85 had no noticeable effects. However now both of my vehicles are forced induction which would compensate for the lower air density at altitude. In that case I would run the "midgrade" 87 in those areas just like I run regular 87 in lower elevations.


2015 F150 XLT SCrew 2.7 Eco-Boost
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2018 Ford Edge SEL Eco-Boost 2.0
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Re: Chevron is now 85 octane?? [Re: cb4017] #4046316 03/22/16 09:13 PM
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7,000 feet here. mid-grade is 87. Oddly, my Ford says to use 87 octane regular and it doesn't say anything about it being OK to use less at altitude.

Just an oversight in the manual, I imagine.

Re: Chevron is now 85 octane?? [Re: dave1251] #4046323 03/22/16 09:24 PM
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Cujet Offline
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Originally Posted By: dave1251
Why? Less dense air means less air being squeezed in the cylinders=less power and heat. Less heat means a lower octane requirement because ignition detonation is less. So lower elevation locations require more octane and higher elevations require less.


Many of today's cars are turbocharged or supercharged. Altitude plays no role in turbocharged automotive engine performance. The lower octane negatively affects boosted engines. In fact, some cars require 93 octane, with good reason.

Last edited by Cujet; 03/22/16 09:26 PM.

People who count on their fingers should maintain a discreet silence.
Re: Chevron is now 85 octane?? [Re: Cujet] #4046363 03/22/16 10:04 PM
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Originally Posted By: Cujet
Originally Posted By: dave1251
Why? Less dense air means less air being squeezed in the cylinders=less power and heat. Less heat means a lower octane requirement because ignition detonation is less. So lower elevation locations require more octane and higher elevations require less.


Many of today's cars are turbocharged or supercharged. Altitude plays no role in turbocharged automotive engine performance. The lower octane negatively affects boosted engines. In fact, some cars require 93 octane, with good reason.


In theory a forced induction engine would not lose power at altitude with the turbo/super charger compensating for the lower density. However in reality, in order to accomplish this the turbine would need to spin at a greater rpm to suck in enough air to compensate for the lower density. This will result in you needing to run higher engine rpm's to attain the power resulting in a greater lag before the power comes on. In addition, higher engine and turbine rpm's means increased engine temperatures above the designed efficiency range and increased temperatures means decreased power. Finally the CAC will not cool intake air as efficiently because the lower density air will not provide as much cooling at 6000 feet as it would at sea level.

So while they will see less power loss than a normally aspirated engine, they will still lose power.


2015 F150 XLT SCrew 2.7 Eco-Boost
5w-30 Magnatec, FL2062

2018 Ford Edge SEL Eco-Boost 2.0
5w-30 Magnatec, FL-910S




Re: Chevron is now 85 octane?? [Re: BikeWhisperer] #4046452 03/23/16 01:09 AM
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The lowering of the octane is a recent change. The octane at this Chevron last time I got gas there was 87/89/91. I equate lower octane to lower quality and it irritates me to pay a top tier gas price for lower quality.


Cliff
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Re: Chevron is now 85 octane?? [Re: Cujet] #4046492 03/23/16 03:49 AM
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Originally Posted By: Cujet
Many of today's cars are turbocharged or supercharged. Altitude plays no role in turbocharged automotive engine performance. The lower octane negatively affects boosted engines. In fact, some cars require 93 octane, with good reason.

That may be quite true, but to the gas companies really care? They sell what they've traditionally sold in a locale, or sell what they're required to sell. Only one company here has a premium above 91, simply because the rest don't "have to" and it isn't customary.


Plain, simple Garak.

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Re: Chevron is now 85 octane?? [Re: cb4017] #4046552 03/23/16 06:08 AM
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Originally Posted By: cb4017
I equate lower octane to lower quality and it irritates me to pay a top tier gas price for lower quality.


You can do that, but it is wrong.

Last edited by Hollow; 03/23/16 06:09 AM.
Re: Chevron is now 85 octane?? [Re: Hollow] #4046569 03/23/16 06:35 AM
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Originally Posted By: Hollow
Originally Posted By: cb4017
I equate lower octane to lower quality and it irritates me to pay a top tier gas price for lower quality.


You can do that, but it is wrong.

I don't think so.
Lets say cb has been happily paying 2.00 for 87 octane regular. There is a 20 cent spread, so 89 is 2.20, and 91 premium is 2.40. Now, his local station brings in 85, 87, and 89. If the price isn't reduced accordingly, he is paying for a lower quality fuel, top tier or not. I agree, vote with your wallet, and buy elsewhere.

Last edited by beanoil; 03/23/16 06:37 AM.
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