93octane vs 93octane with ethanol - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Whitlow · 04-08-2020, 06:21 AM

So fill me in am I better off running 93 with or without ethanol out what? Advantage or disadvantage?

Greenhornet2 · 04-08-2020, 06:36 AM

Stock? Without and you should get better fuel mileage. The ethanol will give you a slight resistance to detonation if your boosted or running a custom tune but it only being around a 10% blend it's not significant.

Whitlow · 04-08-2020, 07:17 AM

I have the SLP585HP supercharger 6psi boost cold air intake special tune. Just wondered if it was worth the extra money for pure? Here it 10%

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pyroguy · 04-08-2020, 07:25 AM

I always preferred filling my tank with ethanol free for winter storage, but sadly I'm no longer close to a gas station with it available. Personally I didn't see enough of an advantage to fill the car up with ethanol free every time. The car did seem to run a little better, but I don't have any quantifiable numbers to prove it. Maybe 1 mpg better and a little more perceived "seat of the pants" feel on acceleration.

Greenhornet2 · 04-08-2020, 07:46 AM

Quote:

Originally Posted by Whitlow

I have the SLP585HP supercharger 6psi boost cold air intake special tune. Just wondered if it was worth the extra money for pure? Here it 10%

Sent from my moto g(7) power using Tapatalk

If you were tuned running the 10% you might actually lose a slight bit of power going to pure and it will run a little richer as ethanol requires more volume to burn. So changing to pure at wot your system will still dump the required amount for the ethanol fuel. Again the differences may be so slight it won't matter. If you tuned on pure it could have the opposite effect if you then run ethanol blend, you might go slightly leaner.
Fuel mileage might not be a big difference in a big engine but on my goldwing i got 15% better fuel mileage on pure.
I'd run what you were tuned running.

ariZona28 · 04-08-2020, 11:40 AM

If you have a choice go with 100% gasoline. Ethanol is a gimmick designed to supposedly stretch fuel supplies and reduce pollution. Now we have plenty of oil and the air in my area is still crappy. In my older vehicles ethanol wreaks havoc on the fuel systems. Hard for me to believe it won't cause problems in our Camaros in the long run. Heck, we don't even have a maintenance friendly fuel filter. The less crap in the fuel the better. All pump fuel in AZ has ethanol. I can run 94 octane race gas but it is $7 a gal and I must bring a 5 gal can for purchase. My premium choices at big brands are only 91 octane. Wish I had your dilemma.

ADVMax · 04-08-2020, 01:47 PM

As long as I'm getting 93 no alcohol for $2.19 a gal I'll run that!

It may be even less now? Last week when I filled up at my no ethanol station it was $2.19.

such a deal

pincoin · 04-08-2020, 03:11 PM

If your car sits for periods of time use ethanol free. The ethanol attracts moisture which is no good for your car

xstuntman · 04-08-2020, 03:28 PM

I've heard a lot of bad about ethanol and some might be true.

Parked a little used Briggs and Stratton mower several years back after i got a big rider. Fast forward, my father needed a push mower, preferably free. Got it out, dumped what little gas was in the tank and poured in new. After sitting for three years it started on the fourth pull, no starting fluid, no extra maintenance , no cleaning out a gummed up carb, etc. If all the horror stories are true i would think it should have just sat there laughing at us.

Maybe we just got lucky?

Greenhornet2 · 04-08-2020, 05:35 PM

Cars are designed to run on the ethanol blend now it's been around for a long time. If your car is going to sit for many months you should be using a stabilizer anyway, 100% gasoline degrades from sitting as well. Only ever had a problem in small engines that fuel was left in the carb for long periods of time. Old technology lots of rubber to degrade and such. Modern cars just aren't like this. I mean guys run e85 and don't hear much about actual problems with those systems.

Whitlow · 04-08-2020, 07:31 PM

So I'm going to stick with 93 10% ethanol I'm going to be driving it on a regular basis. And if I think it will sit for awhile I'll run the ethanol gas or and fill her with 93 pure and some stabil.

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TheFlyingBananaSS · 04-08-2020, 07:48 PM

I paid $1.65 a gal. For regular in my Buick last week!

04-08-2020, 06:21 AM	#1
Whitlow Drives: Chevrolet Camaro Join Date: Mar 2020 Location: Virginia Posts: 138	93octane vs 93octane with ethanol So fill me in am I better off running 93 with or without ethanol out what? Advantage or disadvantage? __________________

04-08-2020, 06:36 AM	#2
Greenhornet2 Drives: 2011 Camaro 2SS LS3 Whipple Join Date: May 2019 Location: Connecticut Posts: 1,925	Stock? Without and you should get better fuel mileage. The ethanol will give you a slight resistance to detonation if your boosted or running a custom tune but it only being around a 10% blend it's not significant. __________________ Whipple 2.9 CAI ID1050x injectors ZL1 Pump JRE FPCM JMS Voltage booster JRE Rough Idle blower cam BTR .660 springs CHE trunnion kit 1 7/8 Speed Engineering Borla Atak JRE scoop 1.5" lowering springs BMR trailing arms and toe links Cradle inserts 704WHP 603WTQ 93 octane

04-08-2020, 07:17 AM	#3
Whitlow Drives: Chevrolet Camaro Join Date: Mar 2020 Location: Virginia Posts: 138	I have the SLP585HP supercharger 6psi boost cold air intake special tune. Just wondered if it was worth the extra money for pure? Here it 10% Sent from my moto g(7) power using Tapatalk __________________

04-08-2020, 07:25 AM	#4
pyroguy Started#gottalovethatblue Drives: ABM #831 Join Date: Apr 2013 Location: TN Posts: 6,919 View My Garage	I always preferred filling my tank with ethanol free for winter storage, but sadly I'm no longer close to a gas station with it available. Personally I didn't see enough of an advantage to fill the car up with ethanol free every time. The car did seem to run a little better, but I don't have any quantifiable numbers to prove it. Maybe 1 mpg better and a little more perceived "seat of the pants" feel on acceleration. __________________ '10 Camaro 2SS/RS \| Aqua Blue #831 of 3,903 \| Silver Stripes Check out my build thread

04-08-2020, 11:40 AM	#6
ariZona28 Give speed a chance Drives: 2015 Camaro 2LS, 2015 Camaro Z/28 Join Date: Nov 2019 Location: Mesa, Az Posts: 2,234	If you have a choice go with 100% gasoline. Ethanol is a gimmick designed to supposedly stretch fuel supplies and reduce pollution. Now we have plenty of oil and the air in my area is still crappy. In my older vehicles ethanol wreaks havoc on the fuel systems. Hard for me to believe it won't cause problems in our Camaros in the long run. Heck, we don't even have a maintenance friendly fuel filter. The less crap in the fuel the better. All pump fuel in AZ has ethanol. I can run 94 octane race gas but it is $7 a gal and I must bring a 5 gal can for purchase. My premium choices at big brands are only 91 octane. Wish I had your dilemma. Attached Images __________________ 2LS: a TREMENDOUS machine. Z/28: it's a BIT MORE POWERFUL, of course.

04-08-2020, 01:47 PM	#7
ADVMax Sporting Foole Drives: 2010 Camaro SS Join Date: Sep 2019 Location: Alabama Posts: 500	As long as I'm getting 93 no alcohol for $2.19 a gal I'll run that! It may be even less now? Last week when I filled up at my no ethanol station it was $2.19. such a deal

04-08-2020, 03:11 PM	#8
pincoin Camaro owner since 1982 Drives: 2012 Camaro 2SS-RS Conv IBM L99 Join Date: Jul 2009 Location: PA Posts: 1,651	If your car sits for periods of time use ethanol free. The ethanol attracts moisture which is no good for your car __________________ 2012 Camaro RS-SS Conv IBM, L99 1968 Camaro RS Coupe 327 AT 1968 Camaro RS-SS Conv, sold 1993

04-08-2020, 03:28 PM	#9
xstuntman Drives: 2012 Victory Red LFX Join Date: Dec 2012 Location: west central Texas Posts: 1,310	I've heard a lot of bad about ethanol and some might be true. Parked a little used Briggs and Stratton mower several years back after i got a big rider. Fast forward, my father needed a push mower, preferably free. Got it out, dumped what little gas was in the tank and poured in new. After sitting for three years it started on the fourth pull, no starting fluid, no extra maintenance , no cleaning out a gummed up carb, etc. If all the horror stories are true i would think it should have just sat there laughing at us. Maybe we just got lucky? __________________ 2018 SS wheels, red Heritage grille, actual driving lights, ZL1 strut tower brace, GM Performance billet aluminum fuel door, front grille Bowtie delete, painted red rotors and calipers, 1/4 window American Flags, splash guards, AEM dry panel air filter.

04-08-2020, 05:35 PM	#10
Greenhornet2 Drives: 2011 Camaro 2SS LS3 Whipple Join Date: May 2019 Location: Connecticut Posts: 1,925	Cars are designed to run on the ethanol blend now it's been around for a long time. If your car is going to sit for many months you should be using a stabilizer anyway, 100% gasoline degrades from sitting as well. Only ever had a problem in small engines that fuel was left in the carb for long periods of time. Old technology lots of rubber to degrade and such. Modern cars just aren't like this. I mean guys run e85 and don't hear much about actual problems with those systems. __________________ Whipple 2.9 CAI ID1050x injectors ZL1 Pump JRE FPCM JMS Voltage booster JRE Rough Idle blower cam BTR .660 springs CHE trunnion kit 1 7/8 Speed Engineering Borla Atak JRE scoop 1.5" lowering springs BMR trailing arms and toe links Cradle inserts 704WHP 603WTQ 93 octane

04-08-2020, 07:31 PM	#11
Whitlow Drives: Chevrolet Camaro Join Date: Mar 2020 Location: Virginia Posts: 138	So I'm going to stick with 93 10% ethanol I'm going to be driving it on a regular basis. And if I think it will sit for awhile I'll run the ethanol gas or and fill her with 93 pure and some stabil. Sent from my moto g(7) power using Tapatalk __________________

04-08-2020, 07:48 PM	#12
TheFlyingBananaSS Evil Genius of Chevrolet Drives: 2017 Z06, 2019 XTS, 2013 SS Join Date: Feb 2017 Location: New York Posts: 3,260	I paid $1.65 a gal. For regular in my Buick last week! __________________ GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.