• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-

Boost, With Or Without Ethanol?

  • Thread starter Thread starter FoxMustangLvr
  • Start date Start date Jun 9, 2017

FoxMustangLvr

I love my Pimp
SN Certified Technician
Oct 14, 2012
4,968
3,514
204
Spokane, Wa
Jun 9, 2017
#1
  • Jun 9, 2017
  • #1
In my area most gas stations sell 92 Octane with "up to" 10% Ethanol. There there are a few gas stations that are selling Ethanol FREE 92 octane but the price is nearly a dollar more per gallon. Worth it? The places selling them are Chevron and Conoco FYI
 

CarMichael Angelo

my rearend will smell so minty fresh,
15 Year Member
Nov 29, 1999
10,641
8,909
234
Birmingham, al
Jun 9, 2017
#2
  • Jun 9, 2017
  • #2
FoxMustangLvr said:
In my area most gas stations sell 92 Octane with "up to" 10% Ethanol. There there are a few gas stations that are selling Ethanol FREE 92 octane but the price is nearly a dollar more per gallon. Worth it? The places selling them are Chevron and Conoco FYI
Click to expand...

In my unsolicited opinion (provided that you can even see it) ..There is no octane benefit to the non ethanol fuel.
The reason most stations cite as a benefit to the straight gas is that the ethanol in the fuel is a moisture attractant,..which in a cold climate, or high humidity environment could be a bad thing.
 
Reactions: RaggedGT

Davedacarpainter

Chicks can make things hard if they’re inspired...
SN Certified Technician
Nov 28, 2015
11,833
11,634
203
Discordia
Jun 10, 2017
#3
  • Jun 10, 2017
  • #3
What Mike said.
 

a91what

SendMeUrDataLog
10 Year Member
Apr 6, 2011
10,733
6,716
214
Hillsborough county
Jun 10, 2017
#4
  • Jun 10, 2017
  • #4
Just run the cheaper fuel. If you want octane help use a water/meth system and mix in 20-50% methanol....

Distilled water and denatured alcohol make a great 50/50 mix as well for octane boost.

Methonal and alcohol have an octane rating of around 105.

Or you can mix up the super secret formula.

40-50%water 40%alcohol 10-20%toluene

Toluene has an octane rating of 118 but is more expensive than denatured alcohol.
 

tannerc91gt

This last 25% is foreign territory at this point
Founding Member
Nov 29, 1999
4,392
2,967
234
Indiana
Jun 10, 2017
#5
  • Jun 10, 2017
  • #5
Why are we avoiding ethanol? From a performance perspective
 

Chuckman

GTFO you fat, heavy bastard
15 Year Member
Oct 21, 2005
1,604
1,002
173
st. louis, mo
Jun 11, 2017
#6
  • Jun 11, 2017
  • #6
tannerc91gt said:
Why are we avoiding ethanol? From a performance perspective
Click to expand...
There's more btu's (energy) in a gallon of straight gas than in a blended one, meaning more power (and better fuel economy), though with the 10% blend it's trivial (e85 is a whole other story and has some benefits that may or may not outweigh the downsides). Also, as Mike said, there's a longevity issue with the blended stuff if it sits for too long.

I say tune it for the blend since its the more common nationally, meaning if you ever take the thing on a trip you won't have to worry about finding non blended fuel (non existent around here for example).
 

a91what

SendMeUrDataLog
10 Year Member
Apr 6, 2011
10,733
6,716
214
Hillsborough county
Jun 11, 2017
#7
  • Jun 11, 2017
  • #7
Even if we are concerned about the tune it's a nominal difference. Nothing that EGO correction can't take care of.
 

FoxMustangLvr

I love my Pimp
SN Certified Technician
Oct 14, 2012
4,968
3,514
204
Spokane, Wa
Jun 12, 2017
#8
  • Jun 12, 2017
  • #8
Thanks for the info guys, even you too @madmike1157 . I'll get me some of the Ethanol free gas for my YZ250F dirt bike and leave it out of my car.
 

JoeDaddy

Honey, I need a check for $30k to pay the hooker
10 Year Member
Apr 20, 2010
760
647
144
SW Michigan
Jun 12, 2017
#9
  • Jun 12, 2017
  • #9
I buy the non ethanol gas for my small engines. I burned up a chain saw with regular gas "with up to 10% ethanol" The small engine guy told me to get the pure gas for anything that was 2 stroke. Now, I do that, and I use it for anything smaller then a car (Lawnmowers, etc..)
 
Reactions: FoxMustangLvr
You must log in or register to reply here.

Similar threads

Fox Is the fox market for average cars crashing in your area?
  • rednotch
  • Oct 2, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
7
Views
633
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Oct 13, 2025
FastDriver
Forced Induction Total Timing under boost
  • Dontknowchit
  • Aug 27, 2025
  • Fox 5.0 Mustang Tech
Replies
2
Views
382
Fox 5.0 Mustang Tech Aug 28, 2025
Dontknowchit
T
  • Locked
1990 2.3L automatic - real bad engine sputtering
  • the_steve_randolph
  • Jun 13, 2024
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
10
Views
1K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Jun 14, 2024
the_steve_randolph
T
F
Ford 460 swap
  • Ford460
  • Sep 13, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
6
Views
293
1996 - 2004 SN95 Mustang -General/Talk- Sep 14, 2026
Ford460
F
SN95 Desktop 363 Engine Combination - Looking for input
  • WhiteCobra95
  • Sep 8, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
11
Views
2K
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Oct 6, 2025
Habu135
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?