Recent Topics
Valvoline Advanced 5W40 MST
by BurntMusic - 02/21/20 06:04 PM
2014 F250, 6.7L 13,000 OCI Amsoil AME 15w40
by claluja - 02/21/20 05:43 PM
What Are These On My Caliper Pistons?
by Fitz98 - 02/21/20 05:37 PM
Gun carry insurance
by Colt - 02/21/20 05:25 PM
drywall crack. how do i fix it?
by WhyMe - 02/21/20 02:55 PM
Yokohama AVID Ascend GT
by Bottom_Feeder - 02/21/20 02:53 PM
Getting my Chevy 4.3 to 300k
by CharlotteB - 02/21/20 02:16 PM
Updated PDS for Valvoline ME
by buster - 02/21/20 01:56 PM
Havoline ProDS Full Synthetic
by Fordiesel69 - 02/21/20 01:32 PM
Correct oil for flat tappets
by Gokhan - 02/21/20 11:55 AM
Laser tachometer?
by Elkins45 - 02/21/20 11:13 AM
Best beginner press?
by MVFarms - 02/21/20 10:20 AM
Help me pick a generator size
by dlundblad - 02/21/20 09:56 AM
...musical 'flat-tappet' oils
by Mad_Max_Sam - 02/21/20 09:44 AM
KIA
by WyrTwister - 02/21/20 09:42 AM
Valvoline NextGen Conventional
by Char Baby - 02/21/20 07:20 AM
Let's Talk Porsche 911
by john_pifer - 02/21/20 02:51 AM
CLEARANCE ALERT O'Reilly's Mobil Super Oil
by GMguy84 - 02/21/20 01:27 AM
Newest Members
onuryas, vidirola, CharlotteB, Grennx, coverage
70766 Registered Users
Who's Online Now
99 registered members (apollo18, AC1DD, ammolab, Alfred_B, alchargo, 97K15004WD, 8 invisible), 2,401 guests, and 17 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics301,754
Posts5,202,146
Members70,766
Most Online4,538
Jan 20th, 2020
Donate to BITOG
Print Thread
Hop To
Page 1 of 3 1 2 3
How accurate is the octane rating at the pump ? #5162196 07/16/19 05:33 AM
Joined: Sep 2004
Posts: 23,835
Mr Nice Offline OP
OP Offline
Joined: Sep 2004
Posts: 23,835
Just wondering if there is a city / state agency that ensures the accuracy of octane rating at gas stations ?

Couldn't some shady stations be selling 87 octane as premium 93 octane ?

How often would this agency test the pumps for octane, not the actual volume of gas pumped ?

Re: How accurate is the octane rating at the pump ? [Re: Mr Nice] #5162204 07/16/19 05:41 AM
Joined: Mar 2011
Posts: 493
H
hemitruck Offline
Offline
H
Joined: Mar 2011
Posts: 493
The is agency responsible for units, weights and measures. Not sure if it is federal or a state agency. IIRC, in no octane is allowed + or - 2. Of course.this info may have changed.

Re: How accurate is the octane rating at the pump ? [Re: Mr Nice] #5162205 07/16/19 05:41 AM
Joined: Apr 2010
Posts: 4,606
B
BMWTurboDzl Offline
Offline
B
Joined: Apr 2010
Posts: 4,606

Last edited by BMWTurboDzl; 07/16/19 05:42 AM.

“It took untold generations to get you where you are. A little gratitude might be in order. If you’re going to insist on bending the world to your way, you better have your reasons.”

435i
Re: How accurate is the octane rating at the pump ? [Re: Mr Nice] #5162207 07/16/19 05:44 AM
Joined: Jun 2015
Posts: 5,678
V
Virtus_Probi Offline
Offline
V
Joined: Jun 2015
Posts: 5,678
I did notice at an out of the way station up in the Whites of NH that the pumps had the numbers "925" hastily slapped over where it had said "93" for the premium.
I would assume an inspector came by and forced them to stop advertising 93 based upon his testing?
I was impressed that the testing apparently was good to 0.5 octane...


2014 Forester XT, 111000 miles
Last Change;
M1 0W30 AFE
Tokyo Roki 15208AA170 filter
Re: How accurate is the octane rating at the pump ? [Re: Mr Nice] #5162212 07/16/19 05:47 AM
Joined: Oct 2004
Posts: 10,029
B
bullwinkle Offline
Offline
B
Joined: Oct 2004
Posts: 10,029
Wish Ohio would test, incl. ethanol percentages-we’re lucky they test volume here.


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: How accurate is the octane rating at the pump ? [Re: Mr Nice] #5162223 07/16/19 05:57 AM
Joined: Jun 2002
Posts: 13,547
K
Kestas Offline
Global Moderator
Offline
Global Moderator
K
Joined: Jun 2002
Posts: 13,547
Originally Posted by Mr Nice
Couldn't some shady stations be selling 87 octane as premium 93 octane ?

It's been reported on the BMW forums that some stations do this. Some BMW models are sensitive enough to where the computer records the octane of gas used.

Re: How accurate is the octane rating at the pump ? [Re: Virtus_Probi] #5162226 07/16/19 06:01 AM
Joined: Jun 2002
Posts: 13,547
K
Kestas Offline
Global Moderator
Offline
Global Moderator
K
Joined: Jun 2002
Posts: 13,547
Originally Posted by Virtus_Probi
I did notice at an out of the way station up in the Whites of NH that the pumps had the numbers "925" hastily slapped over where it had said "93" for the premium.
I would assume an inspector came by and forced them to stop advertising 93 based upon his testing?
I was impressed that the testing apparently was good to 0.5 octane...

I'll bet the station owner argued that 92.5 rounds up to 93. After all, the octane is posted at 93, not 93.0. We use the same argument at work when checking material to specification.

Re: How accurate is the octane rating at the pump ? [Re: Kestas] #5162232 07/16/19 06:20 AM
Joined: Jun 2015
Posts: 5,678
V
Virtus_Probi Offline
Offline
V
Joined: Jun 2015
Posts: 5,678
Originally Posted by Kestas
Originally Posted by Mr Nice
Couldn't some shady stations be selling 87 octane as premium 93 octane ?

It's been reported on the BMW forums that some stations do this. Some BMW models are sensitive enough to where the computer records the octane of gas used.

I wondered about this when my FXT started running poorly after a fillup on a very warm (for where I live) Saturday.
The FA20DIT has had some issues with surging in hot weather, but it was fine for the 2 hours or so I was driving around in the same weather before I got gas at a (very expensive!) Cumby station I almost never use.
My manual says that down to 87 can be used if necessary with the caveat that it probably won't run well below 91 octane. 93 is preferred per Subaru and a Subaru dealer told me that I had better not come to them complaining about how poorly my car was running if I didn't use SHELL 93!

Originally Posted by Kestas
Originally Posted by Virtus_Probi
I did notice at an out of the way station up in the Whites of NH that the pumps had the numbers "925" hastily slapped over where it had said "93" for the premium.
I would assume an inspector came by and forced them to stop advertising 93 based upon his testing?
I was impressed that the testing apparently was good to 0.5 octane...

I'll bet the station owner argued that 92.5 rounds up to 93. After all, the octane is posted at 93, not 93.0. We use the same argument at work when checking material to specification.

I am sure the owner must have been hot about that one!
I can't imagine why else the numbers would have been changed if an inspector hadn't forced it...I think this was when I still had a "RAV6" that ran fine on 87, so I didn't care.


2014 Forester XT, 111000 miles
Last Change;
M1 0W30 AFE
Tokyo Roki 15208AA170 filter
Re: How accurate is the octane rating at the pump ? [Re: Mr Nice] #5162247 07/16/19 06:49 AM
Joined: Jan 2013
Posts: 3,651
W
WyrTwister Offline
Offline
W
Joined: Jan 2013
Posts: 3,651
I know , in our state , the accuracy ( in gallons ) of the dispensers are certified and supposedly checked . No idea about the octane or % of alcohol .


Wyr
God bless
Re: How accurate is the octane rating at the pump ? [Re: Mr Nice] #5162251 07/16/19 06:58 AM
Joined: Jun 2003
Posts: 20,273
C
Chris142 Offline
Offline
C
Joined: Jun 2003
Posts: 20,273
They check the pump calibration monthly here.i dont know if that includes an octain test or not. Ultimately the fuel in the tanks is the drivers responsibility. No company would allow their driver to put the wrong fuel in the wrong tank. I guess a station owner could bribe the driver?


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: How accurate is the octane rating at the pump ? [Re: Chris142] #5162274 07/16/19 07:15 AM
Joined: Apr 2017
Posts: 3,228
H
hallstevenson Online Content
Online Content
H
Joined: Apr 2017
Posts: 3,228
Originally Posted by Chris142
Ultimately the fuel in the tanks is the drivers responsibility. No company would allow their driver to put the wrong fuel in the wrong tank. I guess a station owner could bribe the driver?

Isn't that the only factor ? How can a station owner manipulate this ?

Re: How accurate is the octane rating at the pump ? [Re: Mr Nice] #5162286 07/16/19 07:28 AM
Joined: Jun 2002
Posts: 13,547
K
Kestas Offline
Global Moderator
Offline
Global Moderator
K
Joined: Jun 2002
Posts: 13,547
By switching covers that are color coded?

Re: How accurate is the octane rating at the pump ? [Re: Kestas] #5162317 07/16/19 08:24 AM
Joined: Apr 2017
Posts: 3,228
H
hallstevenson Online Content
Online Content
H
Joined: Apr 2017
Posts: 3,228
Originally Posted by Kestas
By switching covers that are color coded?

So folks who pay for regular get premium and people who pay for premium get regular ?

Re: How accurate is the octane rating at the pump ? [Re: Kestas] #5162381 07/16/19 09:19 AM
Joined: Jun 2003
Posts: 20,273
C
Chris142 Offline
Offline
C
Joined: Jun 2003
Posts: 20,273
Originally Posted by Kestas
By switching covers that are color coded?

I think most drivers would notice this. When I delivered powder cement I always went to the same places and I knew which colors went to what pipe for the different types I Unloaded.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: How accurate is the octane rating at the pump ? [Re: Virtus_Probi] #5162412 07/16/19 09:50 AM
Joined: Dec 2005
Posts: 13,539
K
kschachn Online Content
Online Content
K
Joined: Dec 2005
Posts: 13,539
Originally Posted by Virtus_Probi
I did notice at an out of the way station up in the Whites of NH that the pumps had the numbers "925" hastily slapped over where it had said "93" for the premium.
I would assume an inspector came by and forced them to stop advertising 93 based upon his testing?
I was impressed that the testing apparently was good to 0.5 octane...

It has been a while since I did octane testing in college and I no longer have access to ASTM standards, but the information I could find online says that the reproducibility of ASTM D2699 is 0.7. If that is correct then two different labs with two different operators cannot resolve the value to 0.5.


1994 BMW 530i, 251K
1996 Honda Accord, 280K
1999 Toyota Sienna, 430K
2000 Toyota ECHO, 284K
Page 1 of 3 1 2 3
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™