11-08-2019, 06:33 AM | #1 |
Drives: 2019 ZL-1 Join Date: Feb 2009
Location: Troy, MI & Naples, FL
Posts: 2,019
|
I have determined that.......
I have determined that for highway cruising the SS doesn't get any better mileage with premium -93 over regular 87. I just drove 1350 miles and the tanks with 87 were no different. 24.6 mpg was the average and no difference.....The M6 also gets worse than what I see most A8 reading some of the threads. No doubt AFM has a lot to do with this.
__________________
2019 ZL-1 Acquired 4/23/21 at 6300 miles. Riverside Blue, A10, PDR. Traded in 2017 2SS with 6M and 32k miles. Continental Extreme Contact Sports. Now has 10,000 miles...
2012 Yukon XL Denali w/ 6.2 AWD |
11-08-2019, 06:39 AM | #2 |
Drives: '16 Garnet Red 1SS Join Date: Mar 2014
Location: College Station, TX
Posts: 3,450
|
I'll keep running premium myself. It's an $11 difference on a completely empty tank vs 87.
__________________
'16 Camaro 1SS
'18 Miata GT Gone: '01 Camaro, '14 Camaro, '90 Miata |
11-08-2019, 06:42 AM | #3 |
Account Suspended
Drives: 18 1SS/1LE Join Date: Jun 2018
Location: Missouri
Posts: 939
|
I ran 87 for months straight after months of 91 and I didn't perceive any difference at all from the drivers seat, wallet was lighter, though. maybe kinda sorta it was a little more wild WOT with 91...
|
11-08-2019, 06:44 AM | #4 | |
|
Quote:
My SS before AFM was tuned out got 25mpg on the way to camarofest, on the way home from camarofest it got 26mpg. 400miles one way.
__________________
Modifications
GM Dark Tail Lights / 3rd Brake Light & Reflectors | LED Reverse Lights | Diode Dynamics Side Markers | Borla "ATAK" Cat Back Exhaust |
|
11-08-2019, 07:11 AM | #5 |
Drives: 18 zl1 Join Date: Aug 2017
Location: central alabama
Posts: 935
|
tit for tat, octane rating won't give you mpg unless your engine is requiring it at the speeds it's running.
technically, your camaro shouldn't see any differences between 93 and 87 if all you do is putt around and cruise. the differences are when you push the engine and the fuel *has* to resist predetonation. |
11-08-2019, 07:36 AM | #6 |
雪の玉
Drives: '22 Z71 RST Silverado Join Date: Feb 2011
Location: South
Posts: 3,415
|
It probably has more to do with being up north that you're on winter-blend fuel, which is real crappy for gas mileage no matter which octane you choose. I've noticed a decrease too over the last month. It will improve once the weather warms up and stations get summer blend again. Even here in NC we get the 2 types of seasonal fuels
|
11-08-2019, 07:38 AM | #7 |
BL1ZZRD
Drives: '16 Camaro 2SS, '20 Equinox Redline Join Date: Jul 2009
Location: Buffalo, NY
Posts: 7,840
|
I don't understand why anyone would use 87 octane in an SS unless it was the only grade available in the area. Mileage won't change but performance sure will as the ECM pulls timing to prevent knock.
|
11-08-2019, 08:06 AM | #8 | |
Drives: 18 zl1 Join Date: Aug 2017
Location: central alabama
Posts: 935
|
Quote:
|
|
11-08-2019, 08:17 AM | #9 | |
Old school tech
Drives: Ruby 1LE - 2024 2SS 1LE Join Date: Mar 2014
Location: San Antonio, TX
Posts: 288
|
Quote:
EXACTLY. Especially in hotter climates, like TX. |
|
11-08-2019, 08:24 AM | #10 |
Drives: 2021 300 Join Date: Jan 2015
Location: New Jersey
Posts: 968
|
Does the octane really matter?
Depending on what you drive, these grades—or octane ratings—matter. For starters, high-performance engines need higher octane fuel. That's because your engine was designed to generate higher compression within the cylinder and increased power. Higher pressure and lower octane aren't a good match. use what is recommended in the owners manual. octane has nothing to do with mileage! |
11-08-2019, 09:25 AM | #11 |
Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016
Location: Ocean City, NJ
Posts: 3,137
|
Fuel economy correlates directly with the fuel's energy density. Octane rating is a measure of knock resistance.
I am going to assume this comparison was E10 87 vs E10 93. Adding 10% ethanol lowers the energy density of gasoline but boosts octane. E10 87 is E0 85 plus 10% ethanol. The difference in energy content is about 3% with a resulting drop in fuel economy that is estimated at 1-3% but ends up being difficult to reproducibly demonstrate because so many factors impact fuel economy. E10 93 gets its octane boost from ethanol and other octane boosting fuels, typically aromatics. Typically the energy content ends up being slightly higher over the base fuel, but, again, we are in the 1-2% range and that difference is negligible. The other factor is E10 means "up to 10%" ethanol. The exact EtOH amount is not published. So the OP may have been testing 87 fuel with 5% ethanol vs 93 fuel with 10%. |
11-08-2019, 09:30 AM | #12 |
Drives: 2017 Camaro SS Join Date: Nov 2018
Location: East Tennessee
Posts: 522
|
Agreed.
__________________
Kevin
Luceo Non Uro |
11-08-2019, 09:51 AM | #13 |
What speed limit?
Drives: 2017 SS 1LE Join Date: Jul 2019
Location: Dallas
Posts: 245
|
Exactly, it doesn't necessarily have to do with better gas mileage. All it does is measure the ability to resist engine knocking. Higher-compression engines need the higher octane so that the fuel doesn’t pre-ignite in the combustion process and damage the motor. I would never run 87 in my SS, but that's a personal opinion.
|
11-08-2019, 09:57 AM | #14 |
Drives: 2016 Garnet Red Camaro 2SS Join Date: Jul 2015
Location: North Carolina
Posts: 5,435
|
I never understood buying a $50k high performance sports car and then running lower non-recommeded octane fuel to save a few dollars. I only run 93 from Top Tier gas stations, I even do it in my 2.0T Equinox that is recommended to use premium octane fuel, it isn't worth possibly having engine issues for a few dollars per fill up...find a Coscto, they run 40 cents cheaper per gallon here by me than any station around for 93, close to 87 prices here.
__________________
2SS Camaro, Garnet Red, Adrenaline Red, NPP, MRC, A8, 5 Split Spoke Bright Silver Wheels (56W)
1100 Status - 7/24/15 (Ordered) 3800 Status - 10/13/15 (Built) 6000 Status - 12/22/15 (Delivered) |
|
|
Post Reply
|
Thread Tools | |
|
|