thoughts on e10 fuel

That spinning thing that makes all of the cool noises. OE and Aftermarket.

Moderators: Helpinators, Moderators

Post Reply
bcmaxx
First Gear
Posts: 218
Joined: Wed Oct 24, 2012 6:30 pm

thoughts on e10 fuel

Post by bcmaxx »

Im currently running regular 91 octane fuel no ethanal. Curious how e10 91 octane fuel would be to run in my legacy turbo? Good,bad? Closest 94 octane is 45min drive away or id use that exclusively
TurnNburn
Second Gear
Posts: 353
Joined: Fri Jul 09, 2010 1:41 am
Location: Bend, Oregon

Re: thoughts on e10 fuel

Post by TurnNburn »

if you have access to non ethanol premium then that's what I would/have used in the past. depending on where you are, all of the blend on the west coast is E15 at least. Less in the winter. Personally i find the variability in the concentration of ethanol in gas annoying and inconsistent even if you only use 1 specific gas station. You can try switching just to see the difference but my butt dyno told me that the non ethanol was worth the extra $.50 per gallon. It drove and idled better, and to me, that was what the car wanted.
1990 NA 2.2 Open Light rally car
mike-tracy
Moderator
Moderator
Posts: 4986
Joined: Tue Aug 25, 2009 7:52 am
Location: Des Moines, Wa

Re: thoughts on e10 fuel

Post by mike-tracy »

You get better mpgs on non ethanol. I wish I could find some for $0.50 more a gallon, cause that's what, $7.50 more a tank
1992 Legacy SS 5mt, build in progress
Josh Colombo wrote: Mon Jan 14, 2002 10:23 am Wait....I'm confused now.
James614
Fourth Gear
Posts: 1744
Joined: Sun Jun 10, 2007 4:35 am
Location: Arkansas

Re: thoughts on e10 fuel

Post by James614 »

Ethanol has lower energy density, and so produces less force per combustion than pure petroleum gas. More fuel must be injected to make up the difference (hence the lower fuel economy).

Also, I'm 99.8% sure companies that sell E10+ mix the fuel such that you don't see the octane benefit of the ethanol.

What I'm saying is, zero benefit from Ethanol blends, except they are usually cheaper.
93 Touring Wagon (EJ20G 5spd Swap) -- Finally back and running strong as ever!

05 Outback 2.5XT 5spd -- Now the wife can have her SUV and get in on the turbo Legacy goodness at the same time.
Legacy777
Site Admin
Site Admin
Posts: 27748
Joined: Tue Oct 15, 2002 11:37 am
Location: Houston, Tx
Contact:

Re: thoughts on e10 fuel

Post by Legacy777 »

Everything being equal and if the blend is truly 10% ethanol with 91 octane the resulting octane from E10 & 91 octane will be higher than just 91 alone.

This is from this website:

"Enhanced Petrol and Engine Performance

Unleaded E10 is United Petroleum’s ethanol-based unleaded petrol offering. As a result of ethanol being present, it has an octane rating of 95; higher than the 91 octane of normal unleaded petrol. Ethanol is a natural octane enhancer - adding ethanol to petrol boosts the octane number and its performance. It also helps the other components in petrol burn more completely thereby having a cleaning effect on a cars fuel system."


However if there is moisture in the tank that the ethanol absorbs that can lower octane rating. If you are getting 91 with E10 blend you'll be better off from a detonation & pre-ignition stand point. However, as others have mentioned the ethanol blend doesn't have as much energy density as pure gasoline.
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT

If you need to get a hold of me please email me rather then pm
nortonjefferson
First Gear
Posts: 136
Joined: Sun Feb 09, 2014 6:20 am
Location: Snohomish Wa

Re: thoughts on e10 fuel

Post by nortonjefferson »

I dont have a boosted leggy right now but my 331k ej22e loves ethanol free fuel. Luckily the station i go to is located in my home town, i have met people from the south sound and beyond at the gas station saying they make the trip up just to get the fuel. The premium is 92-93 octane and fluctuates a small amount depending on the batch of fuel recieved.
Back on topic, i cant say ive ever used e10 and even if i did i wouldnt have reliable information due to my non turbo situation at the moment hahah.
White 1993 L Wagon AWD 5MT-FXT lift, 27” MTs 380xxx miles
White 1991 L sedan AWD 5MT-(Robtune 550 DOHC Ej22t swap coming together) 187xxx miles
Black 2005 LGT 5MT-Ej20x swapped daily, VF40/elh
bcmaxx
First Gear
Posts: 218
Joined: Wed Oct 24, 2012 6:30 pm

Re: thoughts on e10 fuel

Post by bcmaxx »

They finally put in a 94 pump in town. No ethanol. Car runs like a champ
Pntaste4evr99
Winestone Cowboy
Posts: 341
Joined: Thu Mar 26, 2015 4:12 am
Location: Lake Stevens WA

Re: thoughts on e10 fuel

Post by Pntaste4evr99 »

All I've found is 92 with 10% ethanol. Still runs good, but I can't compare with anything.....
94 Winestone SS 5MT Rob 550 20g. (Pickle)
Original WA car with 460k miles and climbing
mike-tracy
Moderator
Moderator
Posts: 4986
Joined: Tue Aug 25, 2009 7:52 am
Location: Des Moines, Wa

Re: thoughts on e10 fuel

Post by mike-tracy »

Pntaste4evr99 wrote:All I've found is 92 with 10% ethanol. Still runs good, but I can't compare with anything.....
Tom Thumb gas in Lake Stevens has or had ethanol free premium. Reset your ecu and try a tank full.
1992 Legacy SS 5mt, build in progress
Josh Colombo wrote: Mon Jan 14, 2002 10:23 am Wait....I'm confused now.
nortonjefferson
First Gear
Posts: 136
Joined: Sun Feb 09, 2014 6:20 am
Location: Snohomish Wa

Re: thoughts on e10 fuel

Post by nortonjefferson »

mike-tracy wrote:
Pntaste4evr99 wrote:All I've found is 92 with 10% ethanol. Still runs good, but I can't compare with anything.....
Tom Thumb gas in Lake Stevens has or had ethanol free premium. Reset your ecu and try a tank full.
The Snohomish co-op also has ethanol free premium as well, i think its $3.39 a gallon right now
White 1993 L Wagon AWD 5MT-FXT lift, 27” MTs 380xxx miles
White 1991 L sedan AWD 5MT-(Robtune 550 DOHC Ej22t swap coming together) 187xxx miles
Black 2005 LGT 5MT-Ej20x swapped daily, VF40/elh
Pntaste4evr99
Winestone Cowboy
Posts: 341
Joined: Thu Mar 26, 2015 4:12 am
Location: Lake Stevens WA

Re: thoughts on e10 fuel

Post by Pntaste4evr99 »

I'll have to try those, funny when u don't have a life u miss things that are right around the corner (so to speak)
94 Winestone SS 5MT Rob 550 20g. (Pickle)
Original WA car with 460k miles and climbing
Legacy777
Site Admin
Site Admin
Posts: 27748
Joined: Tue Oct 15, 2002 11:37 am
Location: Houston, Tx
Contact:

Re: thoughts on e10 fuel

Post by Legacy777 »

That Tom Thumb gets a lot of business, but always had expensive gas when I lived in Lake Stevens.
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
2020 Outback Limted XT

If you need to get a hold of me please email me rather then pm
Post Reply