E85 or 91 for car not driven a lot - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

stlgrym3 · 11-07-2018, 06:05 PM

my BRZ will strictly be my weekend car, most likely i will only drive the car about 20 miles per week. i have flex fuel kit installed and i love to run E85 whenever's possible. but since now the car's going to sit in the garage for long stretch of time between being driven, which fuel is better for the gas tank when car is parked? or it does not matter at all.

Teseo · 11-07-2018, 06:13 PM

You live in cali, i will not worried about that

DarkPira7e · 11-07-2018, 06:22 PM

Pretty sure E85 will be absorbing moisture as it sits, I think 91 is a safer bet here.

Breadman · 11-07-2018, 07:05 PM

you have the kit, put e85 in it but not a full tank.

steve99 · 11-07-2018, 07:49 PM

Quote:

Originally Posted by DarkPira7e

Pretty sure E85 will be absorbing moisture as it sits, I think 91 is a safer bet here.

unless you in the habbit of leaving your fuel cap off, it wont be a problem.

modern fuel tanks are sealed systems, so no moisture to absorb.

Keep fuel cap on, and your E85 storage containers sealed and you can store it for months like normal petrol.

been full time E85 for 5 years , fill tank and 4 by 20 litre jerry cans , lasts me over a month, no problems

DarkPira7e · 11-07-2018, 08:51 PM

Quote:

Originally Posted by steve99

unless you in the habbit of leaving your fuel cap off, it wont be a problem.

modern fuel tanks are sealed systems, so no moisture to absorb.

While I believe you, as a previous AAA driver, people constantly had issues with moisture freezing on really cold days. Plugging bad fuel filters or whatever, it was a job for Isopropyl alcohol. This is in Vermont, I doubt they'd see swing in temperatures like we do (some days will go from 20 above down to 15-20 below freezing overnight)

Xxyion · 11-07-2018, 09:02 PM

I'm in Normal and my BRZ is my weekend only car running E85 as often as I can. Ive had the car sit for a good two weeks one time and it ran and started just fine.

Mr.ac · 11-07-2018, 09:57 PM

Your in socal, store it for decades, you'll be fine no matter what fuel.

steve99 · 11-07-2018, 10:06 PM

Quote:

Originally Posted by DarkPira7e

While I believe you, as a previous AAA driver, people constantly had issues with moisture freezing on really cold days. Plugging bad fuel filters or whatever, it was a job for Isopropyl alcohol. This is in Vermont, I doubt they'd see swing in temperatures like we do (some days will go from 20 above down to 15-20 below freezing overnight)

If you had small amounts of water in E85 it would just mix in, so im a little confused how the moisture would freeze. When we used to get water in petrol tanks we would add a couple of litres of alcohol as it mixed with water and petrol.

Was this problem in older cars that didnt have sealed fuel tank systems ?

DarkPira7e · 11-07-2018, 10:42 PM

Quote:

Originally Posted by steve99

If you had small amounts of water in E85 it would just mix in, so im a little confused how the moisture would freeze. When we used to get water in petrol tanks we would add a couple of litres of alcohol as it mixed with water and petrol.

Was this problem in older cars that didnt have sealed fuel tank systems ?

Not so much in the tank, but the moisture in the filter froze and wouldn't let gas pass. Early 2000s and 90s cars are what I'm referencing. Again, Isopropyl would fix anything mixing in the tank. I still think straight up gasoline is better for a car that sits

B T · 11-08-2018, 11:10 AM

12 mpg (driving like a nut on E85) * 12 gallons (full tank) = 144 miles minimum to empty tank. At 20 miles per week, thats 7 weeks of fuel sitting in the car. Maybe just fill up half when you do so you don't have old E85 sitting in the tank so long.

stlgrym3 · 11-08-2018, 11:28 AM

Quote:

Originally Posted by B T

12 mpg (driving like a nut on E85) * 12 gallons (full tank) = 144 miles minimum to empty tank. At 20 miles per week, thats 7 weeks of fuel sitting in the car. Maybe just fill up half when you do so you don't have old E85 sitting in the tank so long.

yeah, good thinking

11-07-2018, 06:05 PM	#1
stlgrym3 Senior Member Join Date: Nov 2011 Drives: 2017 Subaru BRZ Limited Location: socal Posts: 562 Thanks: 72 Thanked 51 Times in 44 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	E85 or 91 for car not driven a lot my BRZ will strictly be my weekend car, most likely i will only drive the car about 20 miles per week. i have flex fuel kit installed and i love to run E85 whenever's possible. but since now the car's going to sit in the garage for long stretch of time between being driven, which fuel is better for the gas tank when car is parked? or it does not matter at all. Last edited by stlgrym3; 11-07-2018 at 06:17 PM.

11-07-2018, 09:02 PM	#7
Xxyion Lowly Cartuber Join Date: Jul 2016 Drives: 2016 BRZ, 2005 Honda S2000 Location: California Posts: 904 Thanks: 41 Thanked 422 Times in 281 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	I'm in Normal and my BRZ is my weekend only car running E85 as often as I can. Ive had the car sit for a good two weeks one time and it ran and started just fine. __________________ 2016 Limited MT WR Blue BRZ \| Delicious Flash n Go Tune \| Delicious Flex Fuel Kit \| Nameless 2.5" with 5" Mufflers \| JDL UEL Headers \| Bayson R Diffuser/Side Skirts \| APR Front Splitter \| VIS Racing GT Wing \| ST Suspension Coilovers \| Grammlights Rays 57CR 17x9 +38 \| Sumitomo HTR Z iii 235/45/17 \|

11-07-2018, 09:57 PM	#8
Mr.ac [insert cool phrase here] Join Date: Aug 2015 Drives: BRZ Premium Location: Central Coast CA Posts: 2,369 Thanks: 709 Thanked 1,558 Times in 930 Posts Mentioned: 30 Post(s) Tagged: 0 Thread(s)	Your in socal, store it for decades, you'll be fine no matter what fuel. __________________ New daily driver - Subaru BRZ Premium Weekend fun/track car - '91 MR2 Turbo Gen3 Old daily driver - '88 MR2 Supercharged

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11-07-2018, 06:13 PM	#2
Teseo Senior Member Join Date: Jun 2014 Drives: frs Location: Gunsai Posts: 4,877 Thanks: 7,153 Thanked 2,922 Times in 1,769 Posts Mentioned: 23 Post(s) Tagged: 2 Thread(s)	You live in cali, i will not worried about that

11-07-2018, 06:22 PM	#3
DarkPira7e Rust bucket enthusiast Join Date: Feb 2017 Drives: 2013 Turbo Firestorm FRS Location: Vermont Posts: 3,934 Thanks: 3,200 Thanked 4,095 Times in 2,045 Posts Mentioned: 31 Post(s) Tagged: 0 Thread(s)	Pretty sure E85 will be absorbing moisture as it sits, I think 91 is a safer bet here.

11-07-2018, 07:05 PM	#4
Breadman Senior Member Join Date: Jul 2017 Drives: 2017 BRZ w/PP Location: Pa Posts: 1,027 Thanks: 51 Thanked 302 Times in 225 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	you have the kit, put e85 in it but not a full tank.

11-08-2018, 11:10 AM	#11
B T Senior Member Join Date: May 2015 Drives: 15 BRZ, 2003 MR2, '70 Elky, 06 TBSS Location: Mobile, Alabama Posts: 510 Thanks: 194 Thanked 200 Times in 142 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	12 mpg (driving like a nut on E85) * 12 gallons (full tank) = 144 miles minimum to empty tank. At 20 miles per week, thats 7 weeks of fuel sitting in the car. Maybe just fill up half when you do so you don't have old E85 sitting in the tank so long.

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